3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Christie <micha...@cs.wisc.edu>
commit 87eb5b21d92a92ac2da3163039d62df88c2b8422 upstream.
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 <micha...@cs.wisc.edu>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Alasdair G Kergon <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/md/dm.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2433,7 +2433,7 @@ static void dm_queue_flush(struct mapped
*/
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;
@@ -2456,10 +2456,12 @@ struct dm_table *dm_swap_table(struct ma
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);
--
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