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

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Date:   Tue, 10 Aug 2021 18:14:27 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Evgeny Novikov <novikov@...ras.ru>
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

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