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authorNeilBrown <neilb@suse.de>2006-01-06 00:20:40 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:07 -0800
commit1345b1d8adbdeceb1c871d9a4af5e2a700b341c6 (patch)
tree0da1db7d273752ad5281db415e9245f3f3a63383 /drivers/md
parent7dd5d34c6c2da04e8cd0732e08b33cd3359e4bae (diff)
[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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bitmap.c3
-rw-r--r--drivers/md/raid1.c8
-rw-r--r--drivers/md/raid10.c8
-rw-r--r--drivers/md/raid6main.c3
4 files changed, 10 insertions, 12 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index abe415f0c03..ee4a3424a8a 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -626,8 +626,7 @@ static void bitmap_file_unmap(struct bitmap *bitmap)
kfree(map);
kfree(attr);
- if (sb_page)
- put_page(sb_page);
+ safe_put_page(sb_page);
}
static void bitmap_stop_daemon(struct bitmap *bitmap);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 39c10a65683..feea4eeca1d 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -136,7 +136,7 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
out_free_pages:
for (i=0; i < RESYNC_PAGES ; i++)
for (j=0 ; j < pi->raid_disks; j++)
- put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
+ safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < pi->raid_disks )
@@ -156,7 +156,7 @@ static void r1buf_pool_free(void *__r1_bio, void *data)
if (j == 0 ||
r1bio->bios[j]->bi_io_vec[i].bv_page !=
r1bio->bios[0]->bi_io_vec[i].bv_page)
- put_page(r1bio->bios[j]->bi_io_vec[i].bv_page);
+ safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page);
}
for (i=0 ; i < pi->raid_disks; i++)
bio_put(r1bio->bios[i]);
@@ -381,7 +381,7 @@ static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int
/* free extra copy of the data pages */
int i = bio->bi_vcnt;
while (i--)
- put_page(bio->bi_io_vec[i].bv_page);
+ safe_put_page(bio->bi_io_vec[i].bv_page);
}
/* clear the bitmap if all writes complete successfully */
bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
@@ -1907,7 +1907,7 @@ out_free_conf:
if (conf->r1bio_pool)
mempool_destroy(conf->r1bio_pool);
kfree(conf->mirrors);
- put_page(conf->tmppage);
+ safe_put_page(conf->tmppage);
kfree(conf->poolinfo);
kfree(conf);
mddev->private = NULL;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9647ebb0983..fb952000fae 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -132,10 +132,10 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
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 @@ static void r10buf_pool_free(void *__r10_bio, void *data)
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 @@ static int run(mddev_t *mddev)
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;
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 950e5fa6e1f..06b32bd671a 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -2072,8 +2072,7 @@ static int run(mddev_t *mddev)
abort:
if (conf) {
print_raid6_conf(conf);
- if (conf->spare_page)
- put_page(conf->spare_page);
+ safe_put_page(conf->spare_page);
kfree(conf->stripe_hashtbl);
kfree(conf);
}