lkml.org 
[lkml]   [2012]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] driver core: free devres in device_release
Date
From: Ming Lei <tom.leiming@gmail.com>

device_del can happen anytime, so once it happens,
the devres of the device will be freed inside device_del, but
drivers can't know it has been deleted and may still add
resources into the device, so memory leak is caused.

This patch moves the devres_release_all to fix the problem.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
drivers/base/core.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index f338037..c8fe4a5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -184,6 +184,17 @@ static void device_release(struct kobject *kobj)
struct device *dev = kobj_to_dev(kobj);
struct device_private *p = dev->p;

+ /*
+ * Some platform devices are driven without driver attached
+ * and managed resources may have been acquired. Make sure
+ * all resources are released.
+ *
+ * Drivers still can add resources into device after device
+ * is deleted but alive, so release devres here to avoid
+ * possible memory leak.
+ */
+ devres_release_all(dev);
+
if (dev->release)
dev->release(dev);
else if (dev->type && dev->type->release)
@@ -1196,13 +1207,6 @@ void device_del(struct device *dev)
bus_remove_device(dev);
driver_deferred_probe_del(dev);

- /*
- * Some platform devices are driven without driver attached
- * and managed resources may have been acquired. Make sure
- * all resources are released.
- */
- devres_release_all(dev);
-
/* Notify the platform of the removal, in case they
* need to do anything...
*/
--
1.7.9.5


\
 
 \ /
  Last update: 2012-07-24 20:21    [W:0.058 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site