From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Wed, 17 Oct 2007 18:56:06 +0000 (-0700)
Subject: Merge branch 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block
X-Git-Tag: firefly_0821_release~25093
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c56ec7639288f3e5d6371b0c48d37da93642fc93;hp=fb9fc395174138983a49f2da982ed14caabbe741;p=firefly-linux-kernel-4.4.55.git

Merge branch 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block:
  [BLOCK] blk_rq_map_sg() next_sg fixup
  Revert "[SCSI] Remove full sg table memset()"
---

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 9e3f3cc85d0d..3935469e3662 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1322,8 +1322,8 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
 		  struct scatterlist *sglist)
 {
 	struct bio_vec *bvec, *bvprv;
-	struct scatterlist *next_sg, *sg;
 	struct req_iterator iter;
+	struct scatterlist *sg;
 	int nsegs, cluster;
 
 	nsegs = 0;
@@ -1333,7 +1333,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
 	 * for each bio in rq
 	 */
 	bvprv = NULL;
-	sg = next_sg = &sglist[0];
+	sg = NULL;
 	rq_for_each_segment(bvec, rq, iter) {
 		int nbytes = bvec->bv_len;
 
@@ -1349,8 +1349,10 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
 			sg->length += nbytes;
 		} else {
 new_segment:
-			sg = next_sg;
-			next_sg = sg_next(sg);
+			if (!sg)
+				sg = sglist;
+			else
+				sg = sg_next(sg);
 
 			memset(sg, 0, sizeof(*sg));
 			sg->page = bvec->bv_page;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 0c86be71bb33..aac8a02cbe80 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -764,6 +764,8 @@ struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 		if (unlikely(!sgl))
 			goto enomem;
 
+		memset(sgl, 0, sizeof(*sgl) * sgp->size);
+
 		/*
 		 * first loop through, set initial index and return value
 		 */