proc tty: add struct tty_operations::proc_fops
Used for gradual switch of TTY drivers from using ->read_proc which helps with gradual switch from ->read_proc for the whole tree. As side effect, fix possible race condition when ->data initialized after PDE is hooked into proc tree. ->proc_fops takes precedence over ->read_proc. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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15f7176eb1
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@ -144,16 +144,22 @@ void proc_tty_register_driver(struct tty_driver *driver)
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{
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struct proc_dir_entry *ent;
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if (!driver->ops->read_proc || !driver->driver_name ||
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driver->proc_entry)
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if (!driver->driver_name || driver->proc_entry)
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return;
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ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver);
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if (!ent)
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if (driver->ops->proc_fops) {
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ent = proc_create_data(driver->driver_name, 0, proc_tty_driver,
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driver->ops->proc_fops, driver);
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if (!ent)
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return;
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} else if (driver->ops->read_proc) {
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ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver);
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if (!ent)
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return;
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ent->read_proc = driver->ops->read_proc;
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ent->data = driver;
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} else
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return;
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ent->read_proc = driver->ops->read_proc;
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ent->data = driver;
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driver->proc_entry = ent;
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}
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@ -264,6 +264,7 @@ struct tty_operations {
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int (*poll_get_char)(struct tty_driver *driver, int line);
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void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
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#endif
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const struct file_operations *proc_fops;
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};
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struct tty_driver {
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