diff options
| author | Alexey Dobriyan <adobriyan@gmail.com> | 2009-03-31 15:19:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 08:59:08 -0700 |
| commit | ae149b6bec64a09373ba20fce75f8aa6b14b78fd (patch) | |
| tree | 5e2f1fdfc223b76ab798c87fd25bcff8d5f92eeb | |
| parent | 15f7176eb1cccec0a332541285ee752b935c1c85 (diff) | |
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>
| -rw-r--r-- | fs/proc/proc_tty.c | 20 | ||||
| -rw-r--r-- | include/linux/tty_driver.h | 1 |
2 files changed, 14 insertions, 7 deletions
diff --git a/fs/proc/proc_tty.c b/fs/proc/proc_tty.c index 4a9e0f65ae6..854827b1d46 100644 --- a/fs/proc/proc_tty.c +++ b/fs/proc/proc_tty.c @@ -144,16 +144,22 @@ void proc_tty_register_driver(struct tty_driver *driver) { struct proc_dir_entry *ent; - if (!driver->ops->read_proc || !driver->driver_name || - driver->proc_entry) + if (!driver->driver_name || driver->proc_entry) return; - ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver); - if (!ent) + if (driver->ops->proc_fops) { + ent = proc_create_data(driver->driver_name, 0, proc_tty_driver, + driver->ops->proc_fops, driver); + if (!ent) + return; + } else if (driver->ops->read_proc) { + ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver); + if (!ent) + return; + ent->read_proc = driver->ops->read_proc; + ent->data = driver; + } else return; - ent->read_proc = driver->ops->read_proc; - ent->data = driver; - driver->proc_entry = ent; } diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index 08e088334db..c9a69575ded 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -264,6 +264,7 @@ struct tty_operations { int (*poll_get_char)(struct tty_driver *driver, int line); void (*poll_put_char)(struct tty_driver *driver, int line, char ch); #endif + const struct file_operations *proc_fops; }; struct tty_driver { |