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| author | Alan Cox <alan@linux.intel.com> | 2009-12-12 10:32:36 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-12 14:46:21 -0800 |
| commit | 6698e34720660e18b45e2e3b115ee4584d0c3b5e (patch) | |
| tree | 1e6e136d58a1f66928603f0e48cd8f163fef5196 /drivers/char/tty_io.c | |
| parent | 09cea96caa59fabab3030c53bd698b9b568d959a (diff) | |
| download | linux-6698e34720660e18b45e2e3b115ee4584d0c3b5e.tar.gz linux-6698e34720660e18b45e2e3b115ee4584d0c3b5e.tar.bz2 linux-6698e34720660e18b45e2e3b115ee4584d0c3b5e.zip | |
tty: Fix BKL taken under a spinlock bug introduced in the BKL split
The fasync path takes the BKL (it probably doesn't need to in fact)
while holding the file_list spinlock. You can't do that with the kernel
lock: it causes lock inversions and deadlocks.
Leave the BKL over that bit for the moment.
Identified by AKPM.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Acked-and-Tested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_io.c')
| -rw-r--r-- | drivers/char/tty_io.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 684f0e0b175e..f15df40bc318 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -516,7 +516,6 @@ static void do_tty_hangup(struct work_struct *work) /* inuse_filps is protected by the single kernel lock */ lock_kernel(); check_tty_count(tty, "do_tty_hangup"); - unlock_kernel(); file_list_lock(); /* This breaks for file handles being sent over AF_UNIX sockets ? */ @@ -531,7 +530,6 @@ static void do_tty_hangup(struct work_struct *work) } file_list_unlock(); - lock_kernel(); tty_ldisc_hangup(tty); read_lock(&tasklist_lock); |