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>
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@ -112,6 +112,9 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
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{
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struct scsi_device_handler *dh;
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if (!name || strlen(name) == 0)
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return NULL;
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dh = __scsi_dh_lookup(name);
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if (!dh) {
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request_module("scsi_dh_%s", name);
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