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Subject12/19
From
dec_pending(): only bother spin locking if io->error is going to be
updated. [Kevin Corry]
--- diff/drivers/md/dm.c 2002-12-16 09:41:12.000000000 +0000
+++ source/drivers/md/dm.c 2002-12-16 09:41:16.000000000 +0000
@@ -238,10 +238,11 @@
static spinlock_t _uptodate_lock = SPIN_LOCK_UNLOCKED;
unsigned long flags;

- spin_lock_irqsave(&_uptodate_lock, flags);
- if (error)
+ if (error) {
+ spin_lock_irqsave(&_uptodate_lock, flags);
io->error = error;
- spin_unlock_irqrestore(&_uptodate_lock, flags);
+ spin_unlock_irqrestore(&_uptodate_lock, flags);
+ }

if (atomic_dec_and_test(&io->io_count)) {
if (atomic_dec_and_test(&io->md->pending))
-
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