From: Mikulas Patocka Date: Fri, 28 Mar 2025 15:19:07 +0000 (+0100) Subject: dm-ebs: fix prefetch-vs-suspend race X-Git-Tag: v6.15-rc1~43^2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9c565428788fb9b49066f94ab7b10efc686a0a4c;p=thirdparty%2Fkernel%2Flinux.git dm-ebs: fix prefetch-vs-suspend race 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 Cc: stable@vger.kernel.org --- diff --git a/drivers/md/dm-ebs-target.c b/drivers/md/dm-ebs-target.c index 18ae45dcbfb28..b19b0142a690a 100644 --- a/drivers/md/dm-ebs-target.c +++ b/drivers/md/dm-ebs-target.c @@ -390,6 +390,12 @@ static int ebs_map(struct dm_target *ti, struct bio *bio) 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,