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Message-ID: <112f5047-5a5e-42cc-90b5-f9c2711fa5db@amd.com>
Date: Tue, 2 Jan 2024 10:47:12 -0600
From: Tom Lendacky <thomas.lendacky@....com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
"Borislav Petkov (AMD)" <bp@...en8.de>,
Dan Williams <dan.j.williams@...el.com>,
Dionna Glaze <dionnaglaze@...gle.com>
Cc: kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] virt: sev-guest: Convert to platform remove callback
returning void
On 12/26/23 07:28, 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>
Acked-by: Tom Lendacky <thomas.lendacky@....com>
> ---
> drivers/virt/coco/sev-guest/sev-guest.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
> index bc564adcf499..87f241825bc3 100644
> --- a/drivers/virt/coco/sev-guest/sev-guest.c
> +++ b/drivers/virt/coco/sev-guest/sev-guest.c
> @@ -994,7 +994,7 @@ static int __init sev_guest_probe(struct platform_device *pdev)
> return ret;
> }
>
> -static int __exit sev_guest_remove(struct platform_device *pdev)
> +static void __exit sev_guest_remove(struct platform_device *pdev)
> {
> struct snp_guest_dev *snp_dev = platform_get_drvdata(pdev);
>
> @@ -1003,8 +1003,6 @@ static int __exit sev_guest_remove(struct platform_device *pdev)
> free_shared_pages(snp_dev->request, sizeof(struct snp_guest_msg));
> deinit_crypto(snp_dev->crypto);
> misc_deregister(&snp_dev->misc);
> -
> - return 0;
> }
>
> /*
> @@ -1013,7 +1011,7 @@ static int __exit sev_guest_remove(struct platform_device *pdev)
> * with the SEV-SNP support, it is named "sev-guest".
> */
> static struct platform_driver sev_guest_driver = {
> - .remove = __exit_p(sev_guest_remove),
> + .remove_new = __exit_p(sev_guest_remove),
> .driver = {
> .name = "sev-guest",
> },
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