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-rw-r--r--drivers/md/dm-raid1.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index b08df8b9b2c..86328251375 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -375,16 +375,18 @@ static void rh_inc(struct region_hash *rh, region_t region)
read_lock(&rh->hash_lock);
reg = __rh_find(rh, region);
+
+ atomic_inc(&reg->pending);
+
+ spin_lock_irq(&rh->region_lock);
if (reg->state == RH_CLEAN) {
rh->log->type->mark_region(rh->log, reg->key);
- spin_lock_irq(&rh->region_lock);
reg->state = RH_DIRTY;
list_del_init(&reg->list); /* take off the clean list */
- spin_unlock_irq(&rh->region_lock);
}
+ spin_unlock_irq(&rh->region_lock);
- atomic_inc(&reg->pending);
read_unlock(&rh->hash_lock);
}
@@ -408,6 +410,10 @@ static void rh_dec(struct region_hash *rh, region_t region)
if (atomic_dec_and_test(&reg->pending)) {
spin_lock_irqsave(&rh->region_lock, flags);
+ if (atomic_read(&reg->pending)) { /* check race */
+ spin_unlock_irqrestore(&rh->region_lock, flags);
+ return;
+ }
if (reg->state == RH_RECOVERING) {
list_add_tail(&reg->list, &rh->quiesced_regions);
} else {