linux-kernel - [PATCH] x86/intel_rdt: Fix incorrect returned value when creating rdgroup sub-directory in resctrl file system

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Date:   Thu, 22 Feb 2018 19:26:03 -0800
From:   "Fenghua Yu" <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>
Cc:     "Tony Luck" <tony.luck@...el.com>,
        "Shivappa, Vikas" <vikas.shivappa@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Xiaochen Shen" <xiaochen.shen@...el.com>,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Wang Hui <john.wanghui@...wei.com>,
        Zhang Yanfei <yanfei.zhang@...wei.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH] x86/intel_rdt: Fix incorrect returned value when creating rdgroup sub-directory in resctrl file system

From: Wang Hui <john.wanghui@...wei.com>

If no monitoring feature is detected because all monitoring features are
disabled during boot time or there is no monitoring feature in hardware,
creating rdtgroup sub-directory by "mkdir" command reports error:

#mkdir /sys/fs/resctrl/p1
mkdir: cannot create directory ‘/sys/fs/resctrl/p1’: No such file or
directory

But the sub-directory actually is generated and content is correct:

#ls /sys/fs/resctrl/p1
cpus  cpus_list  schemata  tasks

The error is because rdtgroup_mkdir_ctrl_mon() returns non zero value after
the sub-directory is created and the returned value is reported as an error
to user.

Clear the returned value to report to user that the sub-directory is
actually created successfully.

Signed-off-by: Wang Hui <john.wanghui@...wei.com>
Signed-off-by: Zhang Yanfei <yanfei.zhang@...wei.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index bdab7d2f51af..fca759d272a1 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1804,6 +1804,7 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
 		goto out_common_fail;
 	}
 	closid = ret;
+	ret = 0;
 
 	rdtgrp->closid = closid;
 	list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
-- 
2.5.0