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SubjectRe: [PATCH] Free struct device in fw_dev_release()
On Wed, 08 Jul 2009 11:17:40 +0100,
Catalin Marinas <catalin.marinas@arm.com> wrote:

> 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 6acf70f078ca 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>
> Cc: Cornelia Huck <cornelia.huck@de.ibm.com>

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>

> Acked-by: Ming Lei <tom.leiming@gmail.com>
> ---
> drivers/base/firmware_class.c | 6 ++----
> 1 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index ddeb819..fc46653 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -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);
>


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