From 266d4f40370757459f8aa063976c932d0de5e59b Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 6 Mar 2007 19:20:11 +0000 Subject: [PATCH] [PATCH] suspend regression: sysfs deadlock Suspend deadlocks when trying to unregister /sys/block/sr0. This comes from Oliver's commit 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 "Driver core: fix race in sysfs between sysfs_remove_file() and read()/write()". sysfs_write_file downs buffer->sem while calling flush_write_buffer, and flushing that particular write buffer entails downing buffer->sem in orphan_all_buffers, resulting in the obvious self-deadlock. Signed-off-by: Linus Torvalds --- fs/sysfs/inode.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index dd1344b007f..ccb7d722c55 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -227,11 +227,8 @@ static inline void orphan_all_buffers(struct inode *node) mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD); if (node->i_private) { - list_for_each_entry(buf, &set->associates, associates) { - down(&buf->sem); + list_for_each_entry(buf, &set->associates, associates) buf->orphaned = 1; - up(&buf->sem); - } } mutex_unlock(&node->i_mutex); } -- 2.41.1