linux-kernel - Re: [PATCH 06/11] firmware: qemu_fw_cfg: Convert to platform remove callback returning void

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Date: Wed, 27 Dec 2023 15:46:18 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Gabriel Somlo <somlo@....edu>, kernel@...gutronix.de,
	qemu-devel@...gnu.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/11] firmware: qemu_fw_cfg: Convert to platform remove
 callback returning void

On Wed, Dec 27, 2023 at 05:26:30PM +0100, Uwe Kleine-König wrote:
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is ignored (apart
> from emitting a warning) and this typically results in resource leaks.
> 
> To improve here there is a quest to make the remove callback return
> void. In the first step of this quest all drivers are converted to
> .remove_new(), which already returns void. Eventually after all drivers
> are converted, .remove_new() will be renamed to .remove().
> 
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

I don't mind.

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/firmware/qemu_fw_cfg.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
> index 1448f61173b3..03da9a4354f8 100644
> --- a/drivers/firmware/qemu_fw_cfg.c
> +++ b/drivers/firmware/qemu_fw_cfg.c
> @@ -731,7 +731,7 @@ static int fw_cfg_sysfs_probe(struct platform_device *pdev)
>  	return err;
>  }
>  
> -static int fw_cfg_sysfs_remove(struct platform_device *pdev)
> +static void fw_cfg_sysfs_remove(struct platform_device *pdev)
>  {
>  	pr_debug("fw_cfg: unloading.\n");
>  	fw_cfg_sysfs_cache_cleanup();
> @@ -739,7 +739,6 @@ static int fw_cfg_sysfs_remove(struct platform_device *pdev)
>  	fw_cfg_io_cleanup();
>  	fw_cfg_kset_unregister_recursive(fw_cfg_fname_kset);
>  	fw_cfg_kobj_cleanup(fw_cfg_sel_ko);
> -	return 0;
>  }
>  
>  static const struct of_device_id fw_cfg_sysfs_mmio_match[] = {
> @@ -758,7 +757,7 @@ MODULE_DEVICE_TABLE(acpi, fw_cfg_sysfs_acpi_match);
>  
>  static struct platform_driver fw_cfg_sysfs_driver = {
>  	.probe = fw_cfg_sysfs_probe,
> -	.remove = fw_cfg_sysfs_remove,
> +	.remove_new = fw_cfg_sysfs_remove,
>  	.driver = {
>  		.name = "fw_cfg",
>  		.of_match_table = fw_cfg_sysfs_mmio_match,
> -- 
> 2.43.0