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| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-04-30 00:53:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:41 -0700 |
| commit | 0ee9cbb3c705903db9c258047d9ce87096e6a1a1 (patch) | |
| tree | ba3b3a4b85ef19cf8c4e3019e813603a160bb039 /drivers/char/tty_ioctl.c | |
| parent | 5d0fdf1e01899805b6c2c0b789a707dcb731b1ea (diff) | |
| download | lwn-0ee9cbb3c705903db9c258047d9ce87096e6a1a1.tar.gz lwn-0ee9cbb3c705903db9c258047d9ce87096e6a1a1.zip | |
tty_ioctl: locking for tty_wait_until_sent
This function still depends on the big kernel lock in some cases. Push
locking into the function ready for removal of the BKL from ioctl call paths.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_ioctl.c')
| -rw-r--r-- | drivers/char/tty_ioctl.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c index d6353d89b451..851cfcd2702a 100644 --- a/drivers/char/tty_ioctl.c +++ b/drivers/char/tty_ioctl.c @@ -21,6 +21,7 @@ #include <linux/module.h> #include <linux/bitops.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -61,11 +62,13 @@ void tty_wait_until_sent(struct tty_struct *tty, long timeout) return; if (!timeout) timeout = MAX_SCHEDULE_TIMEOUT; + lock_kernel(); if (wait_event_interruptible_timeout(tty->write_wait, - !tty->driver->chars_in_buffer(tty), timeout) < 0) - return; - if (tty->driver->wait_until_sent) - tty->driver->wait_until_sent(tty, timeout); + !tty->driver->chars_in_buffer(tty), timeout) >= 0) { + if (tty->driver->wait_until_sent) + tty->driver->wait_until_sent(tty, timeout); + } + unlock_kernel(); } EXPORT_SYMBOL(tty_wait_until_sent); |