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authorBart Van Assche <bart.vanassche@sandisk.com>2017-06-02 14:21:54 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2017-06-12 20:55:59 -0400
commit43f7571be077ee4673466cbcba115427d68440e1 (patch)
tree33dde66c40f3ca9e44001e440874798e6dd33e0a /drivers/scsi/scsi_lib.c
parent551eb598e5ea52996eb821f43740496a78a97b68 (diff)
scsi: Create two versions of scsi_internal_device_unblock()
This will make it easier to serialize SCSI device state changes through a mutex. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Sreekanth Reddy <sreekanth.reddy@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c46
1 files changed, 32 insertions, 14 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index fc8f394eb854..f0eb55744513 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -3023,24 +3023,22 @@ static int scsi_internal_device_block(struct scsi_device *sdev)
}
/**
- * scsi_internal_device_unblock - resume a device after a block request
+ * scsi_internal_device_unblock_nowait - resume a device after a block request
* @sdev: device to resume
- * @new_state: state to set devices to after unblocking
+ * @new_state: state to set the device to after unblocking
*
- * Called by scsi lld's or the midlayer to restart the device queue
- * for the previously suspended scsi device. Called from interrupt or
- * normal process context.
+ * Restart the device queue for a previously suspended SCSI device. Does not
+ * sleep.
*
- * Returns zero if successful or error if not.
+ * Returns zero if successful or a negative error code upon failure.
*
- * Notes:
- * This routine transitions the device to the SDEV_RUNNING state
- * or to one of the offline states (which must be a legal transition)
- * allowing the midlayer to goose the queue for this device.
+ * Notes:
+ * This routine transitions the device to the SDEV_RUNNING state or to one of
+ * the offline states (which must be a legal transition) allowing the midlayer
+ * to goose the queue for this device.
*/
-int
-scsi_internal_device_unblock(struct scsi_device *sdev,
- enum scsi_device_state new_state)
+int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
+ enum scsi_device_state new_state)
{
struct request_queue *q = sdev->request_queue;
unsigned long flags;
@@ -3072,7 +3070,27 @@ scsi_internal_device_unblock(struct scsi_device *sdev,
return 0;
}
-EXPORT_SYMBOL_GPL(scsi_internal_device_unblock);
+EXPORT_SYMBOL_GPL(scsi_internal_device_unblock_nowait);
+
+/**
+ * scsi_internal_device_unblock - resume a device after a block request
+ * @sdev: device to resume
+ * @new_state: state to set the device to after unblocking
+ *
+ * Restart the device queue for a previously suspended SCSI device. May sleep.
+ *
+ * Returns zero if successful or a negative error code upon failure.
+ *
+ * Notes:
+ * This routine transitions the device to the SDEV_RUNNING state or to one of
+ * the offline states (which must be a legal transition) allowing the midlayer
+ * to goose the queue for this device.
+ */
+static int scsi_internal_device_unblock(struct scsi_device *sdev,
+ enum scsi_device_state new_state)
+{
+ return scsi_internal_device_unblock_nowait(sdev, new_state);
+}
static void
device_block(struct scsi_device *sdev, void *data)

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