---

yaml --- r: 68808 b: refs/heads/master c: bd441de h: refs/heads/master v: v3
git-mirror · Oct 12, 2007 · abf527f · abf527f
1 parent 7bc7297
commit abf527f
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Showing 2 changed files with 11 additions and 5 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 358147403d1506ee43335c152fa3864d90f5ef6e
+refs/heads/master: bd441deaf341c524b28fd72831ebf6fef88f1c41
diff --git a/trunk/drivers/scsi/scsi_lib.c b/trunk/drivers/scsi/scsi_lib.c
@@ -301,7 +301,7 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
 {
 	struct request_queue *q = rq->q;
 	int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	unsigned int data_len = 0, len, bytes, off;
+	unsigned int data_len = bufflen, len, bytes, off;
 	struct page *page;
 	struct bio *bio = NULL;
 	int i, err, nr_vecs = 0;
@@ -310,10 +310,15 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
 		page = sgl[i].page;
 		off = sgl[i].offset;
 		len = sgl[i].length;
-		data_len += len;
 
-		while (len > 0) {
+		while (len > 0 && data_len > 0) {
+			/*
+			 * sg sends a scatterlist that is larger than
+			 * the data_len it wants transferred for certain
+			 * IO sizes
+			 */
 			bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+			bytes = min(bytes, data_len);
 
 			if (!bio) {
 				nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
@@ -345,12 +350,13 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
 
 			page++;
 			len -= bytes;
+			data_len -=bytes;
 			off = 0;
 		}
 	}
 
 	rq->buffer = rq->data = NULL;
-	rq->data_len = data_len;
+	rq->data_len = bufflen;
 	return 0;
 
 free_bios: