bsg_map_hdr always calls blk_rq_map_user so commands without data
transfer fail.
This is against the bsg branch in the block tree.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
block/bsg.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/block/bsg.c b/block/bsg.c
index 5d23f97..65729fd 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -301,7 +301,7 @@ bsg_map_hdr(struct bsg_device *bd, int r
return ERR_PTR(ret);
}
- if (!hdr->iovec_count) {
+ if (!hdr->iovec_count && hdr->dxfer_len) {
ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
if (ret)
goto out;
--
1.4.1.1
-
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