3.13.11-ckt36 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Kent Overstreet <kmo@xxxxxxxxxxxxx>
commit 4fa03402cda2fac1a54248c7578b939d95931dc0 upstream.
Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/md/bcache/super.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index ccc0133..a4949ce 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1846,7 +1846,10 @@ static void register_cache(struct cache_sb *sb, struct page *sb_page,
if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache"))
goto err;
+ mutex_lock(&bch_register_lock);
err = register_cache_set(ca);
+ mutex_unlock(&bch_register_lock);
+
if (err)
goto err;
@@ -1908,8 +1911,6 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (!try_module_get(THIS_MODULE))
return -EBUSY;
- mutex_lock(&bch_register_lock);
-
if (!(path = kstrndup(buffer, size, GFP_KERNEL)) ||
!(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL)))
goto err;
@@ -1946,7 +1947,9 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (!dc)
goto err_close;
+ mutex_lock(&bch_register_lock);
register_bdev(sb, sb_page, bdev, dc);
+ mutex_unlock(&bch_register_lock);
} else {
struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca)
@@ -1959,7 +1962,6 @@ out:
put_page(sb_page);
kfree(sb);
kfree(path);
- mutex_unlock(&bch_register_lock);
module_put(THIS_MODULE);
return ret;
--
2.7.0
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