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authorNeilBrown <neilb@suse.de>2012-03-19 12:46:40 +1100
committerNeilBrown <neilb@suse.de>2012-03-19 12:46:40 +1100
commit5a6c824ebb7c9f8dbbc92ffd3528e6366cad1a54 (patch)
treee78d8527ae9e7be05001ed12f1cad01f8719bde0 /drivers/md/bitmap.c
parent278c1ca2f254d0695d2eba79793d20ce785323ea (diff)
md/bitmap: remove some pointless locking.
There is nothing gained by holding a lock while we check if a pointer is NULL or not. If there could be a race, then it could become NULL immediately after the unlock - but there is no race here. So just remove the locking. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/bitmap.c')
-rw-r--r--drivers/md/bitmap.c14
1 files changed, 2 insertions, 12 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index fcf3c9465fd8..e12b515bd471 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -446,18 +446,13 @@ out:
void bitmap_update_sb(struct bitmap *bitmap)
{
bitmap_super_t *sb;
- unsigned long flags;
if (!bitmap || !bitmap->mddev) /* no bitmap for this array */
return;
if (bitmap->mddev->bitmap_info.external)
return;
- spin_lock_irqsave(&bitmap->lock, flags);
- if (!bitmap->sb_page) { /* no superblock */
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ if (!bitmap->sb_page) /* no superblock */
return;
- }
- spin_unlock_irqrestore(&bitmap->lock, flags);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
sb->events = cpu_to_le64(bitmap->mddev->events);
if (bitmap->mddev->events < bitmap->events_cleared)
@@ -683,15 +678,10 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
enum bitmap_mask_op op)
{
bitmap_super_t *sb;
- unsigned long flags;
int old;
- spin_lock_irqsave(&bitmap->lock, flags);
- if (!bitmap->sb_page) { /* can't set the state */
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ if (!bitmap->sb_page) /* can't set the state */
return 0;
- }
- spin_unlock_irqrestore(&bitmap->lock, flags);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
old = le32_to_cpu(sb->state) & bits;
switch (op) {