scsi: core: Improve warning message in scsi_device_block()

If __scsi_internal_device_block() returns an error, it is always -EINVAL
because of an invalid state transition. For debugging purposes, it makes
more sense to print the device state.

Signed-off-by: Martin Wilck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: mwilck

drivers/scsi/scsi_lib.c

@@ -2784,9 +2784,11 @@ EXPORT_SYMBOL_GPL(scsi_internal_device_block_nowait);
 static void scsi_device_block(struct scsi_device *sdev, void *data)
 {
 	int err;
+	enum scsi_device_state state;
 
 	mutex_lock(&sdev->state_mutex);
 	err = __scsi_internal_device_block_nowait(sdev);
+	state = sdev->sdev_state;
 	if (err == 0)
 		/*
 		 * scsi_stop_queue() must be called with the state_mutex
@@ -2797,8 +2799,8 @@ static void scsi_device_block(struct scsi_device *sdev, void *data)
 
 	mutex_unlock(&sdev->state_mutex);
 
-	WARN_ONCE(err, "__scsi_internal_device_block_nowait(%s) failed: err = %d\n",
-		  dev_name(&sdev->sdev_gendev), err);
+	WARN_ONCE(err, "%s: failed to block %s in state %d\n",
+		  __func__, dev_name(&sdev->sdev_gendev), state);
 }
 
 /**