linux-kernel - Re: [PATCH] media: atomisp: Fix error handling in probe

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Date:   Tue, 10 Aug 2021 18:36:59 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Dewar <alex.dewar90@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] media: atomisp: Fix error handling in probe

Hi Dan,

Thank you for these suggestions. I will resend the patch.

Best regards,
Evgeny Novikov

On 10.08.2021 18:14, Dan Carpenter wrote:
> On Tue, Aug 10, 2021 at 02:53:03PM +0300, Evgeny Novikov wrote:
>> There were several issues with handling errors in lm3554_probe():
>> - Probe did not set the error code when v4l2_ctrl_handler_init() failed.
>> - It intermixed gotos for handling errors of v4l2_ctrl_handler_init()
>>    and media_entity_pads_init().
>> - Probe did not free resources in case of failures of
>>    atomisp_register_i2c_module().
>>
>> The patch fixes all these issues.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
> This patch is good, but two things:
>
> 1) Please can you rename all the labels to say what the goto does?
>
> err_uninit:
> 	lm3554_gpio_uninit(client);
> cleanup_media:
>   	media_entity_cleanup(&flash->sd.entity);
> free_handler:
>   	v4l2_ctrl_handler_free(&flash->ctrl_handler);
> unregister_subdev:
>   	v4l2_device_unregister_subdev(&flash->sd);
>
> 2) There is a missing error code still:
>
> drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
>     858          if (ret) {
>     859                  dev_err(&client->dev, "error initialize a ctrl_handler.\n");
>     860                  goto fail3;
>     861          }
>     862
>     863          for (i = 0; i < ARRAY_SIZE(lm3554_controls); i++)
>     864                  v4l2_ctrl_new_custom(&flash->ctrl_handler, &lm3554_controls[i],
>     865                                       NULL);
>     866
>     867          if (flash->ctrl_handler.error) {
>     868                  dev_err(&client->dev, "ctrl_handler error.\n");
>     869                  goto fail3;
>                          ^^^^^^^^^^
> 	err = flash->ctrl_handler.error;
>
>     870          }
>     871
>     872          flash->sd.ctrl_handler = &flash->ctrl_handler;
>     873          err = media_entity_pads_init(&flash->sd.entity, 0, NULL);
>     874          if (err) {
>     875                  dev_err(&client->dev, "error initialize a media entity.\n");
>     876                  goto fail2;
>     877          }
>
> regards,
> dan carpenter
>