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Free struct device in fw_dev_release()

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The f_dev in _request_firmware() is allocated via the fw_setup_device()
and fw_register_device() calls and its class set to firmware_class (the
class release function is fw_dev_release).

Commit 6acf70f078 replaced the kfree(dev) in fw_dev_release() with a
put_device() call but my understanding is that the release function is
called via put_device -> kobject_put -> kref_put -> koject_release etc.
and it should call kfree since it's the last to see this device
structure alive.

Because of that, the _request_firmware() function on its -ENOENT error
path only calls device_unregister(f_dev) which would eventually call
fw_dev_release() but there is no kfree (the subsequent put_device call
would just make the kref negative).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2009-07-08 11:17:40 +01:00 committed by Linus Torvalds
parent d5ce5b40bc
commit 0f2f2221b4
1 changed files with 2 additions and 4 deletions
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6
drivers/base/firmware_class.c
View file

@ -357,7 +357,7 @@ static void fw_dev_release(struct device *dev)
kfree(fw_priv->pages);
kfree(fw_priv->fw_id);
kfree(fw_priv);
put_device(dev);
kfree(dev);
module_put(THIS_MODULE);
}
@ -408,13 +408,11 @@ static int fw_register_device(struct device **dev_p, const char *fw_name,
if (retval) {
dev_err(device, "%s: device_register failed\n", __func__);
put_device(f_dev);
goto error_kfree_fw_id;
return retval;
}
*dev_p = f_dev;
return 0;
error_kfree_fw_id:
kfree(fw_priv->fw_id);
error_kfree:
kfree(f_dev);
kfree(fw_priv);