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dm mpath: eliminate need to use scsi_device_from_queue

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Instead of scsi_device_from_queue(), use scsi_dh_attached_handler_name()
-- whose implementation uses scsi_device_from_queue() to avoid trying to
access SCSI-specific resources from non-SCSI devices.

Fixes buildbot reported issue when CONFIG_SCSI isn't set:
 ERROR: "scsi_device_from_queue" [drivers/md/dm-multipath.ko] undefined!

Fixes: 8d47e65948 ("dm mpath: remove unnecessary NVMe branching in favor of scsi_dh checks")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2018-03-12 19:49:25 -04:00
parent c37366742b
commit e8f74a0f00
1 changed files with 8 additions and 9 deletions
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17
drivers/md/dm-mpath.c
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@ -22,7 +22,6 @@
#include <linux/time.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dh.h>
#include <linux/atomic.h>
#include <linux/blk-mq.h>
@ -805,15 +804,14 @@ static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
return 0;
}
static int setup_scsi_dh(struct block_device *bdev, struct multipath *m, char **error)
static int setup_scsi_dh(struct block_device *bdev, struct multipath *m,
const char *attached_handler_name, char **error)
{
struct request_queue *q = bdev_get_queue(bdev);
const char *attached_handler_name;
int r;
if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags)) {
retain:
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
/*
* Clear any hw_handler_params associated with a
@ -867,7 +865,8 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
int r;
struct pgpath *p;
struct multipath *m = ti->private;
struct scsi_device *sdev;
struct request_queue *q;
const char *attached_handler_name;
/* we need at least a path arg */
if (as->argc < 1) {
@ -886,11 +885,11 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
goto bad;
}
sdev = scsi_device_from_queue(bdev_get_queue(p->path.dev->bdev));
if (sdev) {
put_device(&sdev->sdev_gendev);
q = bdev_get_queue(p->path.dev->bdev);
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
INIT_DELAYED_WORK(&p->activate_path, activate_path_work);
r = setup_scsi_dh(p->path.dev->bdev, m, &ti->error);
r = setup_scsi_dh(p->path.dev->bdev, m, attached_handler_name, &ti->error);
if (r) {
dm_put_device(ti, p->path.dev);
goto bad;