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parport: fix interruptible_sleep_on race

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The interruptible_sleep_on function is can still lead to the
deadlock mentioned in the comment above the caller, and we want
to remove it soon, so replace it now with the race-free
wait_event_interruptible.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2014-02-26 12:01:49 +01:00 committed by Greg Kroah-Hartman
parent 74aeac4da6
commit 76ae0536dd
1 changed files with 2 additions and 1 deletions
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3
drivers/parport/share.c
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@ -905,7 +905,8 @@ int parport_claim_or_block(struct pardevice *dev)
/* If dev->waiting is clear now, an interrupt
gave us the port and we would deadlock if we slept. */
if (dev->waiting) {
interruptible_sleep_on (&dev->wait_q);
wait_event_interruptible(dev->wait_q,
!dev->waiting);
if (signal_pending (current)) {
return -EINTR;
}