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authorHannes Reinecke <hare@suse.de>2017-02-17 09:02:45 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-12 06:41:45 +0100
commite9dc8334d765f7910114921c63a0324272f1f636 (patch)
treee31c39b4e85db8bf02a79019d78a1ba9f0a497e2 /drivers
parent73f5176ecac265b03dcd8ef0aaed6950e5ecb828 (diff)
scsi: use 'scsi_device_from_queue()' for scsi_dh
commit 857de6e00778738dc3d61f75acbac35bdc48e533 upstream. The device handler needs to check if a given queue belongs to a scsi device; only then does it make sense to attach a device handler. [mkp: dropped flags] Signed-off-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/scsi_dh.c22
-rw-r--r--drivers/scsi/scsi_lib.c23
2 files changed, 27 insertions, 18 deletions
diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index b8d3b97b217a..84addee05be6 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -219,20 +219,6 @@ int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
}
EXPORT_SYMBOL_GPL(scsi_unregister_device_handler);
-static struct scsi_device *get_sdev_from_queue(struct request_queue *q)
-{
- struct scsi_device *sdev;
- unsigned long flags;
-
- spin_lock_irqsave(q->queue_lock, flags);
- sdev = q->queuedata;
- if (!sdev || !get_device(&sdev->sdev_gendev))
- sdev = NULL;
- spin_unlock_irqrestore(q->queue_lock, flags);
-
- return sdev;
-}
-
/*
* scsi_dh_activate - activate the path associated with the scsi_device
* corresponding to the given request queue.
@@ -251,7 +237,7 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
struct scsi_device *sdev;
int err = SCSI_DH_NOSYS;
- sdev = get_sdev_from_queue(q);
+ sdev = scsi_device_from_queue(q);
if (!sdev) {
if (fn)
fn(data, err);
@@ -298,7 +284,7 @@ int scsi_dh_set_params(struct request_queue *q, const char *params)
struct scsi_device *sdev;
int err = -SCSI_DH_NOSYS;
- sdev = get_sdev_from_queue(q);
+ sdev = scsi_device_from_queue(q);
if (!sdev)
return err;
@@ -321,7 +307,7 @@ int scsi_dh_attach(struct request_queue *q, const char *name)
struct scsi_device_handler *scsi_dh;
int err = 0;
- sdev = get_sdev_from_queue(q);
+ sdev = scsi_device_from_queue(q);
if (!sdev)
return -ENODEV;
@@ -359,7 +345,7 @@ const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp)
struct scsi_device *sdev;
const char *handler_name = NULL;
- sdev = get_sdev_from_queue(q);
+ sdev = scsi_device_from_queue(q);
if (!sdev)
return NULL;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index e64eae4392a4..d8099c7cab00 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2127,6 +2127,29 @@ void scsi_mq_destroy_tags(struct Scsi_Host *shost)
blk_mq_free_tag_set(&shost->tag_set);
}
+/**
+ * scsi_device_from_queue - return sdev associated with a request_queue
+ * @q: The request queue to return the sdev from
+ *
+ * Return the sdev associated with a request queue or NULL if the
+ * request_queue does not reference a SCSI device.
+ */
+struct scsi_device *scsi_device_from_queue(struct request_queue *q)
+{
+ struct scsi_device *sdev = NULL;
+
+ if (q->mq_ops) {
+ if (q->mq_ops == &scsi_mq_ops)
+ sdev = q->queuedata;
+ } else if (q->request_fn == scsi_request_fn)
+ sdev = q->queuedata;
+ if (!sdev || !get_device(&sdev->sdev_gendev))
+ sdev = NULL;
+
+ return sdev;
+}
+EXPORT_SYMBOL_GPL(scsi_device_from_queue);
+
/*
* Function: scsi_block_requests()
*