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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2007-02-20 13:58:18 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-20 17:10:16 -0800
commit6d740cd5b18bc8128e70f98cfde8c74ebd21cea1 (patch)
treec3283d3e98b04b66f1d8b15ff76dc7362ea12d2d
parentd5c1682f9f8f4aa064f81fda67ea7b91fd829512 (diff)
downloadlinux-stericsson-6d740cd5b18bc8128e70f98cfde8c74ebd21cea1.tar.gz
[PATCH] lockdep: annotate BLKPG_DEL_PARTITION
>============================================= >[ INFO: possible recursive locking detected ] >2.6.19-1.2909.fc7 #1 >--------------------------------------------- >anaconda/587 is trying to acquire lock: > (&bdev->bd_mutex){--..}, at: [<c05fb380>] mutex_lock+0x21/0x24 > >but task is already holding lock: > (&bdev->bd_mutex){--..}, at: [<c05fb380>] mutex_lock+0x21/0x24 > >other info that might help us debug this: >1 lock held by anaconda/587: > #0: (&bdev->bd_mutex){--..}, at: [<c05fb380>] mutex_lock+0x21/0x24 > >stack backtrace: > [<c0405812>] show_trace_log_lvl+0x1a/0x2f > [<c0405db2>] show_trace+0x12/0x14 > [<c0405e36>] dump_stack+0x16/0x18 > [<c043bd84>] __lock_acquire+0x116/0xa09 > [<c043c960>] lock_acquire+0x56/0x6f > [<c05fb1fa>] __mutex_lock_slowpath+0xe5/0x24a > [<c05fb380>] mutex_lock+0x21/0x24 > [<c04d82fb>] blkdev_ioctl+0x600/0x76d > [<c04946b1>] block_ioctl+0x1b/0x1f > [<c047ed5a>] do_ioctl+0x22/0x68 > [<c047eff2>] vfs_ioctl+0x252/0x265 > [<c047f04e>] sys_ioctl+0x49/0x63 > [<c0404070>] syscall_call+0x7/0xb Annotate BLKPG_DEL_PARTITION's bd_mutex locking and add a little comment clarifying the bd_mutex locking, because I confused myself and initially thought the lock order was wrong too. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--block/ioctl.c2
-rw-r--r--fs/block_dev.c7
2 files changed, 8 insertions, 1 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
index e3f5eb9882cf..e06dbe9bc858 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -82,7 +82,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
fsync_bdev(bdevp);
invalidate_bdev(bdevp, 0);
- mutex_lock(&bdev->bd_mutex);
+ mutex_lock_nested(&bdev->bd_mutex, 1);
delete_partition(disk, part);
mutex_unlock(&bdev->bd_mutex);
mutex_unlock(&bdevp->bd_mutex);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0c59b703e9d5..575076c018f4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1101,6 +1101,13 @@ static int __blkdev_get(struct block_device *bdev, mode_t mode, unsigned flags,
int for_part);
static int __blkdev_put(struct block_device *bdev, int for_part);
+/*
+ * bd_mutex locking:
+ *
+ * mutex_lock(part->bd_mutex)
+ * mutex_lock_nested(whole->bd_mutex, 1)
+ */
+
static int do_open(struct block_device *bdev, struct file *file, int for_part)
{
struct module *owner = NULL;