[PATCH v3 7/8] scsi: have scsi_target_block() expect a scsi_target parent argument

[mwilck@suse.com]

From: Martin Wilck <mwilck@suse.com>

All callers (fc_remote_port_delete(), __iscsi_block_session(),
__srp_start_tl_fail_timers(), srp_reconnect_rport(), snic_tgt_del()) pass
parent devices of scsi_target devices to scsi_target_block().
Simplify scsi_target_block() to assume that it is always passed a parent
device.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 drivers/scsi/scsi_lib.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 25ec6eb8df7f..e572fc56a8dd 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2884,17 +2884,25 @@ target_block(struct device *dev, void *data)
 	return 0;
 }
 
+/**
+ * scsi_target_block - transition all SCSI child devices to SDEV_BLOCK state
+ * @dev: a parent device of one or more scsi_target devices
+ *
+ * Iterate over all children of @dev, which should be scsi_target devices,
+ * and switch all subordinate scsi devices to SDEV_BLOCK state. Wait for
+ * ongoing scsi_queue_rq() calls to finish. May sleep.
+ *
+ * Returns zero if successful or a negative error code upon failure.
+ *
+ * Note:
+ * @dev must not itself be a scsi_target device.
+ */
 void
 scsi_target_block(struct device *dev)
 {
 	struct Scsi_Host *shost = dev_to_shost(dev);
 
-	if (scsi_is_target_device(dev))
-		starget_for_each_device(to_scsi_target(dev), NULL,
-					scsi_device_block);
-	else
-		device_for_each_child(dev, NULL, target_block);
-
+	device_for_each_child(dev, NULL, target_block);
 	blk_mq_wait_quiesce_done(&shost->tag_set);
 }
 EXPORT_SYMBOL_GPL(scsi_target_block);
-- 
2.40.1