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parport: make lockdep happy with waitlist_lock 

parport_unregister_device() should never be used when interrupts are
enabled in hardware and irq handler is registered so there is no need to
disable interrupts when using waitlist_lock.  But there is no way to
explain this subtle semantics to lockdep analyzer.

So disable interrupts here too to simplify things.  The price is
negligible.

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Gordeev 2011-01-25 15:07:16 -08:00 committed by Linus Torvalds
parent 0766d20fdb
commit cbeb4b7ad5
1 changed files with 2 additions and 2 deletions
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4
drivers/parport/share.c
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@ -678,7 +678,7 @@ void parport_unregister_device(struct pardevice *dev)
/* Make sure we haven't left any pointers around in the wait
* list. */
spin_lock (&port->waitlist_lock);
spin_lock_irq(&port->waitlist_lock);
if (dev->waitprev || dev->waitnext || port->waithead == dev) {
if (dev->waitprev)
dev->waitprev->waitnext = dev->waitnext;
@ -689,7 +689,7 @@ void parport_unregister_device(struct pardevice *dev)
else
port->waittail = dev->waitprev;
}
spin_unlock (&port->waitlist_lock);
spin_unlock_irq(&port->waitlist_lock);
kfree(dev->state);
kfree(dev);