linux-kernel - Re: [SIL2review] [PATCH] media: tc358743: release device_node in tc358743_probe

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Date:   Sun, 3 Jun 2018 01:11:49 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Nicholas Mc Guire <der.herr@...r.at>
Cc:     Mats Randgaard <matrandg@...co.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        ldv-project@...uxtesting.org, sil2review@...ts.osadl.org,
        linux-kernel@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>,
        linux-media@...r.kernel.org
Subject: Re: [SIL2review] [PATCH] media: tc358743: release device_node in
 tc358743_probe_of()

On 26.05.2018 17:38, Nicholas Mc Guire wrote:
> On Sat, May 26, 2018 at 12:54:00AM +0300, Alexey Khoroshilov wrote:
>> of_graph_get_next_endpoint() returns device_node with refcnt increased,
>> but these is no of_node_put() for it.
> 
> I think this is correct - but would it not be simpler to do
> 
>    endpoint = v4l2_fwnode_endpoint_alloc_parse(of_fwnode_handle(ep));
>    of_node_put(ep);
>    if (IS_ERR(endpoint)) {
>    ....
> 
> As the of_node_put(np) actually is unconditional anyway I think this
> should be semantically equivalent.

You are right. But the same is true for
v4l2_fwnode_endpoint_free(endpoint);
that is already correctly handled by the driver.
So, I have preferred to follow the same pattern.


> 
>>
>> The patch adds one on error and normal paths.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> Reviewed-by: Nicholas Mc Guire <der.herr@...r.at>


Thank you,
Alexey