[PATCH] bsg: fix bogus EINVAL on non-data commands

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Fix a regression introduced in Linux kernel 4.17 where sending a SCSI
command that does not transfer data (such as TEST UNIT READY) via
/dev/bsg/* results in EINVAL.

Fixes: 17cb960f29c2 ("bsg: split handling of SCSI CDBs vs transport requeues")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.17+
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
---
diff --git a/block/bsg.c b/block/bsg.c
index 66602c4..b16ab6f 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -268,7 +268,7 @@ bsg_map_hdr(struct request_queue *q, str
 		ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr->din_xferp),
 				hdr->din_xfer_len, GFP_KERNEL);
 	} else {
-		ret = blk_rq_map_user(q, rq, NULL, NULL, 0, GFP_KERNEL);
+		ret = 0;
 	}
 
 	if (ret)




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