linux-kernel - [017/103] oprofile, ARM: Release resources on failure

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Date:	Fri, 22 Oct 2010 11:50:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Robert Richter <robert.richter@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, Ingo Molnar <mingo@...e.hu>
Subject: [017/103] oprofile, ARM: Release resources on failure

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Robert Richter <robert.richter@....com>

commit 98d943b02f6f1b57787ff1aa6f34d019a407e3ee upstream.

This patch fixes a resource leak on failure, where the
oprofilefs and some counters may not released properly.

Signed-off-by: Robert Richter <robert.richter@....com>
Acked-by: Will Deacon <will.deacon@....com>
Cc: linux-arm-kernel@...ts.infradead.org
LKML-Reference: <20100929145225.GJ13563@...a.amd.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/arm/oprofile/common.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/arm/oprofile/common.c
+++ b/arch/arm/oprofile/common.c
@@ -102,6 +102,7 @@ static int op_create_counter(int cpu, in
 	if (IS_ERR(pevent)) {
 		ret = PTR_ERR(pevent);
 	} else if (pevent->state != PERF_EVENT_STATE_ACTIVE) {
+		perf_event_release_kernel(pevent);
 		pr_warning("oprofile: failed to enable event %d "
 				"on CPU %d\n", event, cpu);
 		ret = -EBUSY;
@@ -365,6 +366,7 @@ int __init oprofile_arch_init(struct opr
 	ret = init_driverfs();
 	if (ret) {
 		kfree(counter_config);
+		counter_config = NULL;
 		return ret;
 	}
 
@@ -402,7 +404,6 @@ void oprofile_arch_exit(void)
 	struct perf_event *event;
 
 	if (*perf_events) {
-		exit_driverfs();
 		for_each_possible_cpu(cpu) {
 			for (id = 0; id < perf_num_counters; ++id) {
 				event = perf_events[cpu][id];
@@ -413,8 +414,10 @@ void oprofile_arch_exit(void)
 		}
 	}
 
-	if (counter_config)
+	if (counter_config) {
 		kfree(counter_config);
+		exit_driverfs();
+	}
 }
 #else
 int __init oprofile_arch_init(struct oprofile_operations *ops)


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