[PATCH 1/2] cpu: fix "crash_notes" leak in register_cpu()

From: Igor Mammedov
Date: Mon May 13 2013 - 18:09:14 EST


"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@xxxxxxxxxx>
---
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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