There's a possible race condition in dm-ebs - dm bufio prefetch may be in
progress while the device is suspended. Fix this by calling
dm_bufio_client_reset in the postsuspend hook.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/md/dm-ebs-target.c | 7 +++++++
1 file changed, 7 insertions(+)
Index: linux-2.6/drivers/md/dm-ebs-target.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-ebs-target.c 2025-02-24 12:41:49.000000000 +0100
+++ linux-2.6/drivers/md/dm-ebs-target.c 2025-03-28 15:41:13.000000000 +0100
@@ -390,6 +390,12 @@ static int ebs_map(struct dm_target *ti,
return DM_MAPIO_REMAPPED;
}
+static void ebs_postsuspend(struct dm_target *ti)
+{
+ struct ebs_c *ec = ti->private;
+ dm_bufio_client_reset(ec->bufio);
+}
+
static void ebs_status(struct dm_target *ti, status_type_t type,
unsigned int status_flags, char *result, unsigned int maxlen)
{
@@ -447,6 +453,7 @@ static struct target_type ebs_target = {
.ctr = ebs_ctr,
.dtr = ebs_dtr,
.map = ebs_map,
+ .postsuspend = ebs_postsuspend,
.status = ebs_status,
.io_hints = ebs_io_hints,
.prepare_ioctl = ebs_prepare_ioctl,
