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authorMike Christie <michaelc@cs.wisc.edu>2013-03-01 22:45:48 +0000
committerAlasdair G Kergon <agk@redhat.com>2013-03-01 22:45:48 +0000
commit87eb5b21d92a92ac2da3163039d62df88c2b8422 (patch)
treeada6ec7e575e4b95a018ecbe023af135da2b639e /drivers/md/dm.c
parent23cb21092eb9dcec9d3604b68d95192b79915890 (diff)
dm: fix limits initialization when there are no data devices
dm_calculate_queue_limits will first reset the provided limits to defaults using blk_set_stacking_limits; whereby defeating the purpose of retaining the original live table's limits -- as was intended via commit 3ae706561637331aa578e52bb89ecbba5edcb7a9 ("dm: retain table limits when swapping to new table with no devices"). Fix this improper limits initialization (in the no data devices case) by avoiding the call to dm_calculate_queue_limits. [patch header revised by Mike Snitzer] Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org # v3.6+ Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0890abd9dff..1016c14c28a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2446,7 +2446,7 @@ static void dm_queue_flush(struct mapped_device *md)
*/
struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
- struct dm_table *live_map, *map = ERR_PTR(-EINVAL);
+ struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL);
struct queue_limits limits;
int r;
@@ -2469,10 +2469,12 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
dm_table_put(live_map);
}
- r = dm_calculate_queue_limits(table, &limits);
- if (r) {
- map = ERR_PTR(r);
- goto out;
+ if (!live_map) {
+ r = dm_calculate_queue_limits(table, &limits);
+ if (r) {
+ map = ERR_PTR(r);
+ goto out;
+ }
}
map = __bind(md, table, &limits);