diff options
| author | Mark Brown <broonie@linaro.org> | 2014-05-22 00:17:27 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-05-22 00:17:27 +0100 |
| commit | bfbc344732badffe94f096f929e4a105b3b92d1f (patch) | |
| tree | f4fc6c06108495bd2c33ecff68c065514e66a8cc /fs/kernfs/inode.c | |
| parent | c9eaa447e77efe77b7fa4c953bd62de8297fd6c5 (diff) | |
| parent | c6466950e917890be3050171f6745ccb9d91d35f (diff) | |
Merge tag 'mfd-regulator-v3.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into regulator-bcm590xxx
Immutable branch between MFD and Regulator due for v3.16 merge-window.
Diffstat (limited to 'fs/kernfs/inode.c')
| -rw-r--r-- | fs/kernfs/inode.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c index abb0f1f53d9..985217626e6 100644 --- a/fs/kernfs/inode.c +++ b/fs/kernfs/inode.c @@ -48,14 +48,18 @@ void __init kernfs_inode_init(void) static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) { + static DEFINE_MUTEX(iattr_mutex); + struct kernfs_iattrs *ret; struct iattr *iattrs; + mutex_lock(&iattr_mutex); + if (kn->iattr) - return kn->iattr; + goto out_unlock; kn->iattr = kzalloc(sizeof(struct kernfs_iattrs), GFP_KERNEL); if (!kn->iattr) - return NULL; + goto out_unlock; iattrs = &kn->iattr->ia_iattr; /* assign default attributes */ @@ -65,8 +69,10 @@ static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME; simple_xattrs_init(&kn->iattr->xattrs); - - return kn->iattr; +out_unlock: + ret = kn->iattr; + mutex_unlock(&iattr_mutex); + return ret; } static int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr) |