[PATCH] md: define and use safe_put_page for md
md sometimes call put_page on NULL pointers (treating it like kfree). This is
not safe, so define and use a 'safe_put_page' which checks for NULL.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9647ebb..fb95200 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -132,10 +132,10 @@
out_free_pages:
for ( ; i > 0 ; i--)
- put_page(bio->bi_io_vec[i-1].bv_page);
+ safe_put_page(bio->bi_io_vec[i-1].bv_page);
while (j--)
for (i = 0; i < RESYNC_PAGES ; i++)
- put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
+ safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < nalloc )
@@ -155,7 +155,7 @@
struct bio *bio = r10bio->devs[j].bio;
if (bio) {
for (i = 0; i < RESYNC_PAGES; i++) {
- put_page(bio->bi_io_vec[i].bv_page);
+ safe_put_page(bio->bi_io_vec[i].bv_page);
bio->bi_io_vec[i].bv_page = NULL;
}
bio_put(bio);
@@ -2042,7 +2042,7 @@
out_free_conf:
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
- put_page(conf->tmppage);
+ safe_put_page(conf->tmppage);
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;