Lock queue limits when reading them, so that we don't read halfway
modified values.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/md/dm-table.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/md/dm-table.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-table.c 2025-04-14 16:02:04.000000000 +0200
+++ linux-2.6/drivers/md/dm-table.c 2025-04-14 16:02:04.000000000 +0200
@@ -431,6 +431,7 @@ static int dm_set_device_limits(struct d
return 0;
}
+ mutex_lock(&q->limits_lock);
if (blk_stack_limits(limits, &q->limits,
get_start_sect(bdev) + start) < 0)
DMWARN("%s: adding target device %pg caused an alignment inconsistency: "
@@ -448,6 +449,7 @@ static int dm_set_device_limits(struct d
*/
if (!dm_target_has_integrity(ti->type))
queue_limits_stack_integrity_bdev(limits, bdev);
+ mutex_unlock(&q->limits_lock);
return 0;
}
@@ -1722,8 +1724,12 @@ static int device_not_write_zeroes_capab
sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
+ int b;
- return !q->limits.max_write_zeroes_sectors;
+ mutex_lock(&q->limits_lock);
+ b = !q->limits.max_write_zeroes_sectors;
+ mutex_unlock(&q->limits_lock);
+ return b;
}
static bool dm_table_supports_write_zeroes(struct dm_table *t)
