linux-kernel - [PATCH 1/2] cpu: fix "crash_notes" leak in register

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Message-Id: <1368482732-25554-2-git-send-email-imammedo@redhat.com>
Date:	Tue, 14 May 2013 00:05:31 +0200
From:	Igor Mammedov <imammedo@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, konrad.wilk@...cle.com,
	chuck.anderson@...cle.com, imammedo@...hat.com
Subject: [PATCH 1/2] cpu: fix "crash_notes" leak in register_cpu()

"crash_notes" is dinamically created with device_create_file() but
isn't anywhere deleted.
Define "crash_notes" statically via attribute groups so that
device_register would create it automatically and file would be
destroyed when CPU is destroyed.

Signed-off-by: Igor Mammedov <imammedo@...hat.com>
---
 drivers/base/cpu.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index fb10728..02e4d73 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -132,8 +132,24 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
 	return rc;
 }
 static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
+
+static struct attribute *crash_note_cpu_attrs[] = {
+	&dev_attr_crash_notes.attr,
+	NULL
+};
+
+static struct attribute_group crash_note_cpu_attr_group = {
+	.attrs = crash_note_cpu_attrs,
+};
 #endif
 
+static const struct attribute_group *common_cpu_attr_groups[] = {
+#ifdef CONFIG_KEXEC
+	&crash_note_cpu_attr_group,
+#endif
+	NULL
+};
+
 /*
  * Print cpu online, possible, present, and system maps
  */
@@ -248,6 +264,7 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
 #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
 	cpu->dev.bus->uevent = arch_cpu_uevent;
 #endif
+	cpu->dev.groups = common_cpu_attr_groups;
 	error = device_register(&cpu->dev);
 	if (!error && cpu->hotpluggable)
 		register_cpu_control(cpu);
@@ -256,10 +273,6 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
 	if (!error)
 		register_cpu_under_node(num, cpu_to_node(num));
 
-#ifdef CONFIG_KEXEC
-	if (!error)
-		error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
-#endif
 	return error;
 }
 
-- 
1.7.1

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