diff options
Diffstat (limited to 'fs/sysfs/inode.c')
| -rw-r--r-- | fs/sysfs/inode.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index 38bbe071cc1..5266eec15f6 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -246,9 +246,23 @@ static inline void orphan_all_buffers(struct inode *node) */ void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent) { - struct dentry * dentry = sd->s_dentry; + struct dentry *dentry = NULL; struct inode *inode; + /* We're not holding a reference to ->s_dentry dentry but the + * field will stay valid as long as sysfs_lock is held. + */ + spin_lock(&sysfs_lock); + spin_lock(&dcache_lock); + + /* dget dentry if it's still alive */ + if (sd->s_dentry && sd->s_dentry->d_inode) + dentry = dget_locked(sd->s_dentry); + + spin_unlock(&dcache_lock); + spin_unlock(&sysfs_lock); + + /* drop dentry */ if (dentry) { spin_lock(&dcache_lock); spin_lock(&dentry->d_lock); @@ -268,6 +282,8 @@ void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent) spin_unlock(&dentry->d_lock); spin_unlock(&dcache_lock); } + + dput(dentry); } } |