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authorTejun Heo <tj@kernel.org>2009-04-15 22:10:23 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-22 08:35:09 +0200
commit23c560a99d78bddf5c251bfa97bce19e4da4b3f3 (patch)
tree5c86aecb937ec49effaaf7cca526baf36c9c3eaf /lib/scatterlist.c
parent091069740304c979f957ceacec39c461d0192158 (diff)
downloadlinux-2.6.38-lt-ux500-23c560a99d78bddf5c251bfa97bce19e4da4b3f3.tar.gz
scatterlist: make sure sg_miter_next() doesn't return 0 sized mappings
Impact: fix not-so-critical but annoying bug sg_miter_next() returns 0 sized mapping if there is an zero sized sg entry in the list or at the end of each iteration. As the users always check the ->length field, this bug shouldn't be critical other than causing unnecessary iteration. Fix it. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'lib/scatterlist.c')
-rw-r--r--lib/scatterlist.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index b7b449dafbe..a295e404e90 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -347,9 +347,12 @@ bool sg_miter_next(struct sg_mapping_iter *miter)
sg_miter_stop(miter);
/* get to the next sg if necessary. __offset is adjusted by stop */
- if (miter->__offset == miter->__sg->length && --miter->__nents) {
- miter->__sg = sg_next(miter->__sg);
- miter->__offset = 0;
+ while (miter->__offset == miter->__sg->length) {
+ if (--miter->__nents) {
+ miter->__sg = sg_next(miter->__sg);
+ miter->__offset = 0;
+ } else
+ return false;
}
/* map the next page */