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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 15:19:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 08:59:08 -0700
commitae149b6bec64a09373ba20fce75f8aa6b14b78fd (patch)
tree5e2f1fdfc223b76ab798c87fd25bcff8d5f92eeb
parent15f7176eb1cccec0a332541285ee752b935c1c85 (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.c20
-rw-r--r--include/linux/tty_driver.h1
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 {