* [PATCH] percpu_counter: fix irq restore in __percpu_counter_add
@ 2013-10-03 10:15 Christoph Hellwig
2013-10-03 16:21 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Christoph Hellwig @ 2013-10-03 10:15 UTC (permalink / raw)
To: Shaohua Li, Jens Axboe; +Cc: linux-kernel
The current version of "percpu_counter: make APIs irq safe" in the blk-mq
tree doesn't properly restore irqs, thus causing the boot of the blk-multique
tree to fail with various irqs_disabled() BUGs and related issues.
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 1ae43a7..7473ee3 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -82,7 +82,7 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
unsigned long flags;
raw_spin_lock_irqsave(&fbc->lock, flags);
fbc->count += count;
- raw_spin_unlock(&fbc->lock);
+ raw_spin_unlock_irqrestore(&fbc->lock, flags);
__this_cpu_write(*fbc->counters, 0);
} else {
__this_cpu_write(*fbc->counters, count);
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2013-10-03 10:15 [PATCH] percpu_counter: fix irq restore in __percpu_counter_add Christoph Hellwig
2013-10-03 16:21 ` Jens Axboe
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