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)
