[PATCH] dm: move idr_pre_get
idr_pre_get() can sleep while allocating memory.
The next patch will change _minor_lock into a spinlock, so this patch moves
idr_pre_get() outside the lock in preparation.
[akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled]
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 87d8ca1..6e577e7 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -766,6 +766,10 @@
if (minor >= (1 << MINORBITS))
return -EINVAL;
+ r = idr_pre_get(&_minor_idr, GFP_KERNEL);
+ if (!r)
+ return -ENOMEM;
+
mutex_lock(&_minor_lock);
if (idr_find(&_minor_idr, minor)) {
@@ -773,16 +777,9 @@
goto out;
}
- r = idr_pre_get(&_minor_idr, GFP_KERNEL);
- if (!r) {
- r = -ENOMEM;
- goto out;
- }
-
r = idr_get_new_above(&_minor_idr, MINOR_ALLOCED, minor, &m);
- if (r) {
+ if (r)
goto out;
- }
if (m != minor) {
idr_remove(&_minor_idr, m);
@@ -800,13 +797,11 @@
int r;
unsigned int m;
- mutex_lock(&_minor_lock);
-
r = idr_pre_get(&_minor_idr, GFP_KERNEL);
- if (!r) {
- r = -ENOMEM;
- goto out;
- }
+ if (!r)
+ return -ENOMEM;
+
+ mutex_lock(&_minor_lock);
r = idr_get_new(&_minor_idr, MINOR_ALLOCED, &m);
if (r) {