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driver core: free devres in device_release 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2012-07-25 01:42:29 +08:00 committed by Greg Kroah-Hartman
parent 2221f6ef71
commit a525a3ddea
1 changed files with 11 additions and 7 deletions
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18
drivers/base/core.c
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@ -184,6 +184,17 @@ static void device_release(struct kobject *kobj)
struct device *dev = kobj_to_dev(kobj); struct device *dev = kobj_to_dev(kobj);
struct device_private *p = dev->p; 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) if (dev->release)
dev->release(dev); dev->release(dev);
else if (dev->type && dev->type->release) else if (dev->type && dev->type->release)
@ -1196,13 +1207,6 @@ void device_del(struct device *dev)
bus_remove_device(dev); bus_remove_device(dev);
driver_deferred_probe_del(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 /* Notify the platform of the removal, in case they
* need to do anything... * need to do anything...
*/ */