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authorAlan Jenkins <alan-jenkins@tuffmail.co.uk>2009-07-29 21:07:55 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2009-07-29 21:07:55 +0200
commitdddac6a7b445de95515f64fdf82fe5dc36c02f26 (patch)
tree39651610292d6b0c17f210f253a0dd16b022727d /mm
parentec79be26875f6c1468784876cb99192b7f41c7a5 (diff)
downloadblackbird-op-linux-dddac6a7b445de95515f64fdf82fe5dc36c02f26.tar.gz
blackbird-op-linux-dddac6a7b445de95515f64fdf82fe5dc36c02f26.zip
PM / Hibernate: Replace bdget call with simple atomic_inc of i_count
Create bdgrab(). This function copies an existing reference to a block_device. It is safe to call from any context. Hibernation code wishes to copy a reference to the active swap device. Right now it calls bdget() under a spinlock, but this is wrong because bdget() can sleep. It doesn't need a full bdget() because we already hold a reference to active swap devices (and the spinlock protects against swapoff). Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827 Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'mm')
-rw-r--r--mm/swapfile.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d1ade1a48ee7..8ffdc0d23c53 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -753,7 +753,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
if (!bdev) {
if (bdev_p)
- *bdev_p = bdget(sis->bdev->bd_dev);
+ *bdev_p = bdgrab(sis->bdev);
spin_unlock(&swap_lock);
return i;
@@ -765,7 +765,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
struct swap_extent, list);
if (se->start_block == offset) {
if (bdev_p)
- *bdev_p = bdget(sis->bdev->bd_dev);
+ *bdev_p = bdgrab(sis->bdev);
spin_unlock(&swap_lock);
bdput(bdev);
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