Commit 9c565428 authored by Mikulas Patocka's avatar Mikulas Patocka
Browse files

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: default avatarMikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
parent 2de510fc

drivers/md/dm-ebs-target.c

+7 −0
Original line number Diff line number Diff line
@@ -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,