staging: dgnc: audit goto's in dgnc_tty
TODO file requests fix up of error handling. Audit dgnc_mgmt.c and fix all return paths to be uniform and inline with kernel coding style. Signed-off-by: Tobin C. Harding <me@tobin.cc> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tobin C. Harding
Greg Kroah-Hartman
Родитель
7029064dd1
Коммит
4f22e0fa01
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@ -143,7 +143,6 @@ int dgnc_tty_register(struct dgnc_board *brd)
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TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_DYNAMIC_DEV |
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TTY_DRIVER_HARDWARE_BREAK);
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if (IS_ERR(brd->serial_driver))
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return PTR_ERR(brd->serial_driver);
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@ -181,7 +180,6 @@ int dgnc_tty_register(struct dgnc_board *brd)
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TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_DYNAMIC_DEV |
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TTY_DRIVER_HARDWARE_BREAK);
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if (IS_ERR(brd->print_driver)) {
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rc = PTR_ERR(brd->print_driver);
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goto unregister_serial_driver;
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@ -220,7 +218,6 @@ unregister_serial_driver:
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tty_unregister_driver(brd->serial_driver);
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free_serial_driver:
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put_tty_driver(brd->serial_driver);
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return rc;
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}
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@ -241,6 +238,7 @@ void dgnc_tty_unregister(struct dgnc_board *brd)
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int dgnc_tty_init(struct dgnc_board *brd)
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{
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int i;
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int rc;
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void __iomem *vaddr;
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struct channel_t *ch;
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@ -260,8 +258,10 @@ int dgnc_tty_init(struct dgnc_board *brd)
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*/
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brd->channels[i] = kzalloc(sizeof(*brd->channels[i]),
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GFP_KERNEL);
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if (!brd->channels[i])
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if (!brd->channels[i]) {
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rc = -ENOMEM;
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goto err_free_channels;
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}
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}
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ch = brd->channels[0];
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@ -319,7 +319,7 @@ err_free_channels:
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kfree(brd->channels[i]);
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brd->channels[i] = NULL;
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}
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return -ENOMEM;
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return rc;
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}
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/*
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@ -914,7 +914,6 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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*/
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rc = wait_event_interruptible(brd->state_wait,
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(brd->state & BOARD_READY));
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if (rc)
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return rc;
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@ -922,14 +921,14 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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/* If opened device is greater than our number of ports, bail. */
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if (PORT_NUM(minor) >= brd->nasync) {
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spin_unlock_irqrestore(&brd->bd_lock, flags);
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return -ENXIO;
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rc = -ENXIO;
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goto err_brd_unlock;
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}
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ch = brd->channels[PORT_NUM(minor)];
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if (!ch) {
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spin_unlock_irqrestore(&brd->bd_lock, flags);
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return -ENXIO;
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rc = -ENXIO;
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goto err_brd_unlock;
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}
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/* Drop board lock */
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@ -946,8 +945,8 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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un = &brd->channels[PORT_NUM(minor)]->ch_pun;
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un->un_type = DGNC_PRINT;
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} else {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return -ENXIO;
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rc = -ENXIO;
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goto err_ch_unlock;
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}
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/*
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@ -959,7 +958,6 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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rc = wait_event_interruptible(ch->ch_flags_wait,
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((ch->ch_flags & CH_OPENING) == 0));
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/* If ret is non-zero, user ctrl-c'ed us */
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if (rc)
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return -EINTR;
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@ -975,7 +973,6 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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ch->ch_flags_wait,
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(((ch->ch_tun.un_flags |
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ch->ch_pun.un_flags) & UN_CLOSING) == 0));
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/* If ret is non-zero, user ctrl-c'ed us */
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if (rc)
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return -EINTR;
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@ -1014,7 +1011,6 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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kfree(ch->ch_rqueue);
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kfree(ch->ch_equeue);
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kfree(ch->ch_wqueue);
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return -ENOMEM;
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}
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@ -1082,6 +1078,14 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return rc;
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err_brd_unlock:
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spin_unlock_irqrestore(&brd->bd_lock, flags);
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return rc;
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err_ch_unlock:
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return rc;
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}
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/*
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@ -1093,7 +1097,7 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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struct file *file,
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struct channel_t *ch)
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{
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int retval = 0;
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int rc = 0;
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struct un_t *un = tty->driver_data;
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unsigned long flags;
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uint old_flags = 0;
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@ -1115,13 +1119,13 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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* bail with error.
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*/
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if (ch->ch_bd->state == BOARD_FAILED) {
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retval = -ENXIO;
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rc = -ENXIO;
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break;
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}
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/* If tty was hung up, break out of loop and set error. */
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if (tty_hung_up_p(file)) {
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retval = -EAGAIN;
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rc = -EAGAIN;
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break;
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}
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@ -1146,7 +1150,7 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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break;
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if (tty_io_error(tty)) {
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retval = -EIO;
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rc = -EIO;
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break;
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}
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@ -1165,7 +1169,7 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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* Leave loop with error set.
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*/
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if (signal_pending(current)) {
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retval = -ERESTARTSYS;
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rc = -ERESTARTSYS;
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break;
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}
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@ -1189,12 +1193,12 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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* from the current value.
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*/
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if (sleep_on_un_flags)
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retval = wait_event_interruptible
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rc = wait_event_interruptible
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(un->un_flags_wait,
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(old_flags != (ch->ch_tun.un_flags |
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ch->ch_pun.un_flags)));
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else
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retval = wait_event_interruptible(
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rc = wait_event_interruptible(
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ch->ch_flags_wait,
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(old_flags != ch->ch_flags));
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@ -1208,8 +1212,7 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
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ch->ch_wopen--;
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return retval;
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return rc;
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}
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/*
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@ -1375,7 +1378,7 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
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ushort thead;
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ushort ttail;
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uint tmask;
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uint chars = 0;
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uint chars;
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unsigned long flags;
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if (!tty)
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@ -1397,16 +1400,14 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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if (ttail == thead) {
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if (ttail == thead)
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chars = 0;
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} else {
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if (thead >= ttail)
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chars = thead - ttail;
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else
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chars = thead - ttail + WQUEUESIZE;
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}
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else if (thead > ttail)
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chars = thead - ttail;
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else
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chars = thead - ttail + WQUEUESIZE;
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return chars;
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return (int)chars;
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}
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/*
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@ -1419,6 +1420,8 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
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*/
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static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available)
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{
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int rc = bytes_available;
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if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) {
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int cps_limit = 0;
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unsigned long current_time = jiffies;
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@ -1439,16 +1442,16 @@ static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available)
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cps_limit = 0;
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}
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bytes_available = min(cps_limit, bytes_available);
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rc = min(cps_limit, bytes_available);
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}
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return bytes_available;
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return rc;
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}
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/*
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* dgnc_tty_write_room()
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*
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* Return space available in Tx buffer
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* Return room available in Tx buffer
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*/
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static int dgnc_tty_write_room(struct tty_struct *tty)
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{
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@ -1457,7 +1460,7 @@ static int dgnc_tty_write_room(struct tty_struct *tty)
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ushort head;
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ushort tail;
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ushort tmask;
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int ret = 0;
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int room = 0;
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unsigned long flags;
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if (!tty)
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@ -1477,33 +1480,32 @@ static int dgnc_tty_write_room(struct tty_struct *tty)
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head = (ch->ch_w_head) & tmask;
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tail = (ch->ch_w_tail) & tmask;
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ret = tail - head - 1;
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if (ret < 0)
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ret += WQUEUESIZE;
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room = tail - head - 1;
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if (room < 0)
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room += WQUEUESIZE;
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/* Limit printer to maxcps */
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if (un->un_type != DGNC_PRINT)
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ret = dgnc_maxcps_room(ch, ret);
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room = dgnc_maxcps_room(ch, room);
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/*
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* If we are printer device, leave space for
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* If we are printer device, leave room for
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* possibly both the on and off strings.
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*/
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if (un->un_type == DGNC_PRINT) {
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if (!(ch->ch_flags & CH_PRON))
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ret -= ch->ch_digi.digi_onlen;
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ret -= ch->ch_digi.digi_offlen;
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room -= ch->ch_digi.digi_onlen;
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room -= ch->ch_digi.digi_offlen;
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} else {
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if (ch->ch_flags & CH_PRON)
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ret -= ch->ch_digi.digi_offlen;
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room -= ch->ch_digi.digi_offlen;
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}
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if (ret < 0)
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ret = 0;
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if (room < 0)
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room = 0;
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return ret;
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return room;
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}
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/*
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@ -1657,7 +1659,6 @@ static int dgnc_tty_write(struct tty_struct *tty,
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return count;
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exit_retry:
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return 0;
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}
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@ -1668,20 +1669,20 @@ static int dgnc_tty_tiocmget(struct tty_struct *tty)
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{
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struct channel_t *ch;
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struct un_t *un;
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int result = -EIO;
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int rc = -EIO;
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unsigned char mstat = 0;
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unsigned long flags;
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if (!tty || tty->magic != TTY_MAGIC)
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return result;
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return rc;
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un = tty->driver_data;
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if (!un || un->magic != DGNC_UNIT_MAGIC)
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return result;
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return rc;
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ch = un->un_ch;
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if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
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return result;
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return rc;
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spin_lock_irqsave(&ch->ch_lock, flags);
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@ -1689,22 +1690,22 @@ static int dgnc_tty_tiocmget(struct tty_struct *tty)
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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result = 0;
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rc = 0;
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if (mstat & UART_MCR_DTR)
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result |= TIOCM_DTR;
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rc |= TIOCM_DTR;
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if (mstat & UART_MCR_RTS)
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result |= TIOCM_RTS;
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rc |= TIOCM_RTS;
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if (mstat & UART_MSR_CTS)
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result |= TIOCM_CTS;
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rc |= TIOCM_CTS;
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if (mstat & UART_MSR_DSR)
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result |= TIOCM_DSR;
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rc |= TIOCM_DSR;
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if (mstat & UART_MSR_RI)
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result |= TIOCM_RI;
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rc |= TIOCM_RI;
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if (mstat & UART_MSR_DCD)
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result |= TIOCM_CD;
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rc |= TIOCM_CD;
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return result;
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return rc;
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}
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/*
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@ -1719,23 +1720,23 @@ static int dgnc_tty_tiocmset(struct tty_struct *tty,
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struct dgnc_board *bd;
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struct channel_t *ch;
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struct un_t *un;
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int ret = -EIO;
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int rc = -EIO;
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unsigned long flags;
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if (!tty || tty->magic != TTY_MAGIC)
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return ret;
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return rc;
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un = tty->driver_data;
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if (!un || un->magic != DGNC_UNIT_MAGIC)
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return ret;
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return rc;
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ch = un->un_ch;
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if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
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return ret;
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return rc;
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bd = ch->ch_bd;
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if (!bd || bd->magic != DGNC_BOARD_MAGIC)
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return ret;
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return rc;
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spin_lock_irqsave(&ch->ch_lock, flags);
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@ -1768,23 +1769,23 @@ static int dgnc_tty_send_break(struct tty_struct *tty, int msec)
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struct dgnc_board *bd;
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struct channel_t *ch;
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struct un_t *un;
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int ret = -EIO;
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int rc = -EIO;
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unsigned long flags;
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if (!tty || tty->magic != TTY_MAGIC)
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return ret;
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return rc;
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un = tty->driver_data;
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if (!un || un->magic != DGNC_UNIT_MAGIC)
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return ret;
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return rc;
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ch = un->un_ch;
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if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
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return ret;
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return rc;
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bd = ch->ch_bd;
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if (!bd || bd->magic != DGNC_BOARD_MAGIC)
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return ret;
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return rc;
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switch (msec) {
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case -1:
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@ -1876,11 +1877,11 @@ static void dgnc_tty_send_xchar(struct tty_struct *tty, char c)
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static inline int dgnc_get_mstat(struct channel_t *ch)
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{
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unsigned char mstat;
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int result = 0;
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int rc = -ENXIO;
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unsigned long flags;
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if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
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return -ENXIO;
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return rc;
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spin_lock_irqsave(&ch->ch_lock, flags);
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|
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@ -1888,20 +1889,22 @@ static inline int dgnc_get_mstat(struct channel_t *ch)
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|
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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if (mstat & UART_MCR_DTR)
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result |= TIOCM_DTR;
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if (mstat & UART_MCR_RTS)
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result |= TIOCM_RTS;
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if (mstat & UART_MSR_CTS)
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result |= TIOCM_CTS;
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if (mstat & UART_MSR_DSR)
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result |= TIOCM_DSR;
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if (mstat & UART_MSR_RI)
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result |= TIOCM_RI;
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if (mstat & UART_MSR_DCD)
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result |= TIOCM_CD;
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rc = 0;
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|
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return result;
|
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if (mstat & UART_MCR_DTR)
|
||||
rc |= TIOCM_DTR;
|
||||
if (mstat & UART_MCR_RTS)
|
||||
rc |= TIOCM_RTS;
|
||||
if (mstat & UART_MSR_CTS)
|
||||
rc |= TIOCM_CTS;
|
||||
if (mstat & UART_MSR_DSR)
|
||||
rc |= TIOCM_DSR;
|
||||
if (mstat & UART_MSR_RI)
|
||||
rc |= TIOCM_RI;
|
||||
if (mstat & UART_MSR_DCD)
|
||||
rc |= TIOCM_CD;
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Return modem signals to ld. */
|
||||
|
|
@ -1921,13 +1924,13 @@ static int dgnc_set_modem_info(struct channel_t *ch,
|
|||
unsigned int command,
|
||||
unsigned int __user *value)
|
||||
{
|
||||
int ret = -ENXIO;
|
||||
int rc;
|
||||
unsigned int arg = 0;
|
||||
unsigned long flags;
|
||||
|
||||
ret = get_user(arg, value);
|
||||
if (ret)
|
||||
return ret;
|
||||
rc = get_user(arg, value);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
switch (command) {
|
||||
case TIOCMBIS:
|
||||
|
|
@ -1987,20 +1990,21 @@ static int dgnc_tty_digigeta(struct tty_struct *tty,
|
|||
struct un_t *un;
|
||||
struct digi_t tmp;
|
||||
unsigned long flags;
|
||||
int rc = -EFAULT;
|
||||
|
||||
if (!retinfo)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
if (!tty || tty->magic != TTY_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
un = tty->driver_data;
|
||||
if (!un || un->magic != DGNC_UNIT_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
ch = un->un_ch;
|
||||
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
memset(&tmp, 0, sizeof(tmp));
|
||||
|
||||
|
|
@ -2009,7 +2013,7 @@ static int dgnc_tty_digigeta(struct tty_struct *tty,
|
|||
spin_unlock_irqrestore(&ch->ch_lock, flags);
|
||||
|
||||
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -2027,24 +2031,25 @@ static int dgnc_tty_digiseta(struct tty_struct *tty,
|
|||
struct un_t *un;
|
||||
struct digi_t new_digi;
|
||||
unsigned long flags;
|
||||
int rc = -EFAULT;
|
||||
|
||||
if (!tty || tty->magic != TTY_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
un = tty->driver_data;
|
||||
if (!un || un->magic != DGNC_UNIT_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
ch = un->un_ch;
|
||||
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
bd = ch->ch_bd;
|
||||
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
if (copy_from_user(&new_digi, new_info, sizeof(new_digi)))
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
spin_lock_irqsave(&ch->ch_lock, flags);
|
||||
|
||||
|
|
@ -2353,32 +2358,32 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|||
struct board_ops *ch_bd_ops;
|
||||
struct channel_t *ch;
|
||||
struct un_t *un;
|
||||
int rc;
|
||||
int rc = -ENODEV;
|
||||
unsigned long flags;
|
||||
void __user *uarg = (void __user *)arg;
|
||||
|
||||
if (!tty || tty->magic != TTY_MAGIC)
|
||||
return -ENODEV;
|
||||
return rc;
|
||||
|
||||
un = tty->driver_data;
|
||||
if (!un || un->magic != DGNC_UNIT_MAGIC)
|
||||
return -ENODEV;
|
||||
return rc;
|
||||
|
||||
ch = un->un_ch;
|
||||
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
|
||||
return -ENODEV;
|
||||
return rc;
|
||||
|
||||
bd = ch->ch_bd;
|
||||
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
|
||||
return -ENODEV;
|
||||
return rc;
|
||||
|
||||
ch_bd_ops = bd->bd_ops;
|
||||
|
||||
spin_lock_irqsave(&ch->ch_lock, flags);
|
||||
|
||||
if (un->un_open_count <= 0) {
|
||||
spin_unlock_irqrestore(&ch->ch_lock, flags);
|
||||
return -EIO;
|
||||
rc = -EIO;
|
||||
goto err_unlock;
|
||||
}
|
||||
|
||||
switch (cmd) {
|
||||
|
|
@ -2504,10 +2509,8 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|||
* also.
|
||||
*/
|
||||
rc = tty_check_change(tty);
|
||||
if (rc) {
|
||||
spin_unlock_irqrestore(&ch->ch_lock, flags);
|
||||
return rc;
|
||||
}
|
||||
if (rc)
|
||||
goto err_unlock;
|
||||
|
||||
if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) {
|
||||
ch->ch_r_head = ch->ch_r_tail;
|
||||
|
|
@ -2588,7 +2591,6 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|||
if (cmd == (DIGI_SETAW)) {
|
||||
spin_unlock_irqrestore(&ch->ch_lock, flags);
|
||||
rc = ch_bd_ops->drain(tty, 0);
|
||||
|
||||
if (rc)
|
||||
return -EINTR;
|
||||
|
||||
|
|
@ -2787,4 +2789,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|||
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
err_unlock:
|
||||
spin_unlock_irqrestore(&ch->ch_lock, flags);
|
||||
return rc;
|
||||
}
|
||||
|
|
|
|||
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