From: Li Zefan <lizefan@huawei.com>
Date: Fri, 14 Feb 2014 08:57:27 +0000 (+0800)
Subject: kernfs: fix kernfs_node_from_dentry()
X-Git-Tag: v3.15-rc1~140^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f41c593454943b80a2017c8a2a3d6b1d0b0a6f89;p=pandora-kernel.git

kernfs: fix kernfs_node_from_dentry()

Currently kernfs_node_from_dentry() returns NULL for root dentry,
because root_dentry->d_op == NULL.

Due to this bug cgroupstats_build() returns -EINVAL for root cgroup.

  # mount -t cgroup -o cpuacct /cgroup
  # Documentation/accounting/getdelays -C /cgroup
  fatal reply error,  errno -22

With this fix:

  # Documentation/accounting/getdelays -C /cgroup
  sleeping 305, blocked 0, running 1, stopped 0, uninterruptible 1

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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