]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
tpm: fix sleep-in-spinlock
authorParag Warudkar <pwarudkar@aol.com>
Tue, 8 May 2007 07:31:09 +0000 (00:31 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 8 May 2007 18:15:13 +0000 (11:15 -0700)
commit8e39c933b1b7df501dbb68879fb1640e277b8a5c
tree870bb5506fb670d0e44c00a7d330ee064239298b
parent53ab97a1c1536015d4d6d900363ea96fece5ed97
tpm: fix sleep-in-spinlock

flush_scheduled_work() can sleep, and we're calling it under spinlock.

AFAICS, moving flush_scheduled_work before spin_lock() should not cause any
problems.

Reason being - The only thing that can race against tpm_release is tpm_open
(tpm_release is called when last reference to the file is closed and only
thing that can happen after that is tpm_open??) and tpm_open acquires
driver_lock and more over it bails out with EBUSY if chip->num_opens is
greater than 0.

I also moved chip->num_pending-- to after deleting timer and setting data
pending as it looks more correct for the paranoid although it probably doesn't
matter as it is guarded by driver_lock.  None the less this change should not
cause problems.

While I was at it I noticed a missing NULL check in tpm_register_hardware
which is fixed with this patch as well.

Signed-off-by: Parag Warudkar <parag.warudkar@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/char/tpm/tpm.c