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UBI: Block: Explain usage of blk_rq_map_sg()
author
Richard Weinberger
<richard@nod.at>
Wed, 28 Jan 2015 15:37:40 +0000
(16:37 +0100)
committer
Richard Weinberger
<richard@nod.at>
Wed, 28 Jan 2015 15:37:40 +0000
(16:37 +0100)
Signed-off-by: Richard Weinberger <richard@nod.at>
drivers/mtd/ubi/block.c
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diff --git
a/drivers/mtd/ubi/block.c
b/drivers/mtd/ubi/block.c
index
00caf46
..
995e61c
100644
(file)
--- a/
drivers/mtd/ubi/block.c
+++ b/
drivers/mtd/ubi/block.c
@@
-301,6
+301,12
@@
static void ubiblock_do_work(struct work_struct *work)
struct request *req = blk_mq_rq_from_pdu(pdu);
blk_mq_start_request(req);
+
+ /*
+ * It is safe to ignore the return value of blk_rq_map_sg() because
+ * the number of sg entries is limited to UBI_MAX_SG_COUNT
+ * and ubi_read_sg() will check that limit.
+ */
blk_rq_map_sg(req->q, req, pdu->usgl.sg);
ret = ubiblock_read(pdu);