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authorJohannes Thumshirn <jthumshirn@suse.de>2018-03-23 14:37:05 +0100
committerMartin K. Petersen <martin.petersen@oracle.com>2018-04-09 16:35:12 -0400
commit2ee5671e3ae35e53bb5a53a89ac8f033e4b1721f (patch)
treea73d28aef958f9c4ecb75541e52a3aa5ad576cfc /drivers/scsi
parentcbee67c2d7f97aaa1a85501d621002b4dc1e24b8 (diff)
downloadlinux-2ee5671e3ae35e53bb5a53a89ac8f033e4b1721f.tar.bz2
scsi: scsi_dh: Don't look for NULL devices handlers by name
Currently scsi_dh_lookup() doesn't check for NULL as a device name. This combined with nvme over dm-mpath results in the following messages emitted by device-mapper: device-mapper: multipath: Could not failover device 259:67: Handler scsi_dh_(null) error 14. Let scsi_dh_lookup() fail fast on NULL names. [mkp: typo fix] Cc: <stable@vger.kernel.org> # v4.16 Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/scsi_dh.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index b88b5dbbc444..188f30572aa1 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -112,6 +112,9 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
{
struct scsi_device_handler *dh;
+ if (!name || strlen(name) == 0)
+ return NULL;
+
dh = __scsi_dh_lookup(name);
if (!dh) {
request_module("scsi_dh_%s", name);