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WSL2-Linux-Kernel
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tty: n_hdlc add buffer flushing 

Add flush_buffer tty callback to flush rx buffers.
Add TCFLSH ioctl processing to flush tx buffers.
Increase default tx buffers from 1 to 3.
Remove unneeded flush_buffer call in open callback.
Remove vendor specific CVS version string.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul Fulghum 2009-06-22 18:42:56 +01:00 коммит произвёл Linus Torvalds
Родитель 90ceb9644d
Коммит be10eb7589
1 изменённых файлов: 37 добавлений и 9 удалений
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46
drivers/char/n_hdlc.c
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@ -10,7 +10,6 @@
* Paul Mackerras <Paul.Mackerras@cs.anu.edu.au>
*
* Original release 01/11/99
* $Id: n_hdlc.c,v 4.8 2003/05/06 21:18:51 paulkf Exp $
*
* This code is released under the GNU General Public License (GPL)
*
@ -79,7 +78,6 @@
*/
#define HDLC_MAGIC 0x239e
#define HDLC_VERSION "$Revision: 4.8 $"
#include <linux/module.h>
#include <linux/init.h>
@ -114,7 +112,7 @@
#define MAX_HDLC_FRAME_SIZE 65535
#define DEFAULT_RX_BUF_COUNT 10
#define MAX_RX_BUF_COUNT 60
#define DEFAULT_TX_BUF_COUNT 1
#define DEFAULT_TX_BUF_COUNT 3
struct n_hdlc_buf {
struct n_hdlc_buf *link;
@ -199,6 +197,31 @@ static void n_hdlc_tty_wakeup(struct tty_struct *tty);
#define tty2n_hdlc(tty) ((struct n_hdlc *) ((tty)->disc_data))
#define n_hdlc2tty(n_hdlc) ((n_hdlc)->tty)
static void flush_rx_queue(struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
struct n_hdlc_buf *buf;
while ((buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list)))
n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, buf);
}
static void flush_tx_queue(struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
struct n_hdlc_buf *buf;
unsigned long flags;
while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))
n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);
spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);
if (n_hdlc->tbuf) {
n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, n_hdlc->tbuf);
n_hdlc->tbuf = NULL;
}
spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
}
static struct tty_ldisc_ops n_hdlc_ldisc = {
.owner = THIS_MODULE,
.magic = TTY_LDISC_MAGIC,
@ -211,6 +234,7 @@ static struct tty_ldisc_ops n_hdlc_ldisc = {
.poll = n_hdlc_tty_poll,
.receive_buf = n_hdlc_tty_receive,
.write_wakeup = n_hdlc_tty_wakeup,
.flush_buffer = flush_rx_queue,
};
/**
@ -341,10 +365,7 @@ static int n_hdlc_tty_open (struct tty_struct *tty)
set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
#endif
/* Flush any pending characters in the driver and discipline. */
if (tty->ldisc->ops->flush_buffer)
tty->ldisc->ops->flush_buffer(tty);
/* flush receive data from driver */
tty_driver_flush_buffer(tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
@ -763,6 +784,14 @@ static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
error = put_user(count, (int __user *)arg);
break;
case TCFLSH:
switch (arg) {
case TCIOFLUSH:
case TCOFLUSH:
flush_tx_queue(tty);
}
/* fall through to default */
default:
error = n_tty_ioctl_helper(tty, file, cmd, arg);
break;
@ -919,8 +948,7 @@ static struct n_hdlc_buf* n_hdlc_buf_get(struct n_hdlc_buf_list *list)
} /* end of n_hdlc_buf_get() */
static char hdlc_banner[] __initdata =
KERN_INFO "HDLC line discipline: version " HDLC_VERSION
", maxframe=%u\n";
KERN_INFO "HDLC line discipline maxframe=%u\n";
static char hdlc_register_ok[] __initdata =
KERN_INFO "N_HDLC line discipline registered.\n";
static char hdlc_register_fail[] __initdata =