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scsi: core: fix dh and multipathing for SCSI hosts without request batching

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This was missing from scsi_device_from_queue() due to the introduction of
another new scsi_mq_ops_no_commit of linux-next commit 8930a6c207 ("scsi:
core: add support for request batching") from Martin's scsi/5.4/scsi-queue
or James' scsi/misc.

Only devicehandler code seems to call scsi_device_from_queue():
*** drivers/scsi/scsi_dh.c:
scsi_dh_activate[255]          sdev = scsi_device_from_queue(q);
scsi_dh_set_params[302]        sdev = scsi_device_from_queue(q);
scsi_dh_attach[325]            sdev = scsi_device_from_queue(q);
scsi_dh_attached_handler_name[363] sdev = scsi_device_from_queue(q);

Fixes multipath tools follow-on errors:

$ multipath -v6
...
libdevmapper: ioctl/libdm-iface.c(1887): device-mapper: reload ioctl on mpatha  failed: No such device
...
mpatha: failed to load map, error 19
...

showing also as kernel messages:

device-mapper: table: 252:0: multipath: error attaching hardware handler
device-mapper: ioctl: error adding target to table

Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Fixes: 8930a6c207 ("scsi: core: add support for request batching")
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Steffen Maier 2019-08-07 16:49:48 +02:00 committed by Martin K. Petersen
parent 82a9ac7130
commit 6b6fa7a5c8
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/scsi_lib.c
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@ -1922,7 +1922,8 @@ struct scsi_device *scsi_device_from_queue(struct request_queue *q)
{
struct scsi_device *sdev = NULL;
if (q->mq_ops == &scsi_mq_ops)
if (q->mq_ops == &scsi_mq_ops_no_commit ||
q->mq_ops == &scsi_mq_ops)
sdev = q->queuedata;
if (!sdev || !get_device(&sdev->sdev_gendev))
sdev = NULL;