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Subject[PATCH] oprofile, x86: fix init_sysfs error handling
On 31.08.10 05:31:29, Will Deacon wrote:
> > For x86 wont change the code (actually I found a bug in the init_sysfs
> > error handler for which I will send a fix). Just wanted to get your
> > confirmation in case I was missing something that x86 is not affected.
> > I will apply the first 2 patches, no need to resubmit.

This is the patch, applied to:

git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git urgent

-Robert

--

From 10f0412f57f2a76a90eff4376f59cbb0a39e4e18 Mon Sep 17 00:00:00 2001
From: Robert Richter <robert.richter@amd.com>
Date: Mon, 30 Aug 2010 10:56:18 +0200
Subject: [PATCH] oprofile, x86: fix init_sysfs error handling

On failure init_sysfs() might not properly free resources. The error
code of the function is not checked. And, when reinitializing the exit
function might be called twice. This patch fixes all this.

Cc: stable@kernel.org
Signed-off-by: Robert Richter <robert.richter@amd.com>
---
arch/x86/oprofile/nmi_int.c | 16 +++++++++++++---
1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index f6b48f6..73a41d3 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -568,8 +568,13 @@ static int __init init_sysfs(void)
int error;

error = sysdev_class_register(&oprofile_sysclass);
- if (!error)
- error = sysdev_register(&device_oprofile);
+ if (error)
+ return error;
+
+ error = sysdev_register(&device_oprofile);
+ if (error)
+ sysdev_class_unregister(&oprofile_sysclass);
+
return error;
}

@@ -695,6 +700,8 @@ int __init op_nmi_init(struct oprofile_operations *ops)
char *cpu_type = NULL;
int ret = 0;

+ using_nmi = 0;
+
if (!cpu_has_apic)
return -ENODEV;

@@ -774,7 +781,10 @@ int __init op_nmi_init(struct oprofile_operations *ops)

mux_init(ops);

- init_sysfs();
+ ret = init_sysfs();
+ if (ret)
+ return ret;
+
using_nmi = 1;
printk(KERN_INFO "oprofile: using NMI interrupt.\n");
return 0;
--
1.7.1.1


--
Advanced Micro Devices, Inc.
Operating System Research Center



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