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   1 From foo@baz Sun May 27 16:52:54 CEST 2018
   2 From: Wang Hui <john.wanghui@huawei.com>
   3 Date: Thu, 22 Feb 2018 19:26:03 -0800
   4 Subject: x86/intel_rdt: Fix incorrect returned value when creating rdgroup sub-directory in resctrl file system
   5
   6 From: Wang Hui <john.wanghui@huawei.com>
   7
   8 [ Upstream commit 36e74d355297dde6e69a39c838d24710e442babe ]
   9
  10 If no monitoring feature is detected because all monitoring features are
  11 disabled during boot time or there is no monitoring feature in hardware,
  12 creating rdtgroup sub-directory by "mkdir" command reports error:
  13
  14   mkdir: cannot create directory ‘/sys/fs/resctrl/p1’: No such file or directory
  15
  16 But the sub-directory actually is generated and content is correct:
  17
  18   cpus  cpus_list  schemata  tasks
  19
  20 The error is because rdtgroup_mkdir_ctrl_mon() returns non zero value after
  21 the sub-directory is created and the returned value is reported as an error
  22 to user.
  23
  24 Clear the returned value to report to user that the sub-directory is
  25 actually created successfully.
  26
  27 Signed-off-by: Wang Hui <john.wanghui@huawei.com>
  28 Signed-off-by: Zhang Yanfei <yanfei.zhang@huawei.com>
  29 Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
  30 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  31 Cc: Peter Zijlstra <peterz@infradead.org>
  32 Cc: Ravi V Shankar <ravi.v.shankar@intel.com>
  33 Cc: Thomas Gleixner <tglx@linutronix.de>
  34 Cc: Tony Luck <tony.luck@intel.com>
  35 Cc: Vikas <vikas.shivappa@intel.com>
  36 Cc: Xiaochen Shen <xiaochen.shen@intel.com>
  37 Link: http://lkml.kernel.org/r/1519356363-133085-1-git-send-email-fenghua.yu@intel.com
  38 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  39 Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
  40 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  41 ---
  42  arch/x86/kernel/cpu/intel_rdt_rdtgroup.c |    1 +
  43  1 file changed, 1 insertion(+)
  44
  45 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
  46 +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
  47 @@ -1657,6 +1657,7 @@ static int rdtgroup_mkdir_ctrl_mon(struc
  48         if (ret < 0)
  49                 goto out_common_fail;
  50         closid = ret;
  51 +       ret = 0;
  52
  53         rdtgrp->closid = closid;
  54         list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);