linux-kernel - Re: [PATCH v1] coccinelle: api: Don't use devm_platform_get_and_ioremap

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Date:   Mon, 7 Nov 2022 20:45:38 +0800 (+08)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
cc:     Julia Lawall <Julia.Lawall@...ia.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        linux-kernel@...r.kernel.org, cocci@...ia.fr, kernel@...gutronix.de
Subject: Re: [PATCH v1] coccinelle: api: Don't use devm_platform_get_and_ioremap_resource
 with res==NULL



On Mon, 7 Nov 2022, Uwe Kleine-König wrote:

> devm_platform_get_and_ioremap_resource(pdev, index, NULL) is equivalent to
> the shorter devm_platform_ioremap_resource(pdev, index).
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
> Hello,
>
> a potential improvement is to check for invocations of
> devm_platform_get_and_ioremap_resource() where the res parameter isn't
> used afterwards, but my coccinelle foo isn't strong enough for that.

... when != res

I'm not sure where you wanted to put it though.

julia

>
> Best regards
> Uwe
>
>  .../api/devm_platform_ioremap_resource.cocci  | 44 +++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
>
> diff --git a/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci b/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
> new file mode 100644
> index 000000000000..401610b9a17d
> --- /dev/null
> +++ b/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
> @@ -0,0 +1,44 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/// Don't use devm_platform_get_and_ioremap_resource with NULL as third parameter
> +// Confidence: High
> +
> +virtual patch
> +virtual context
> +virtual org
> +virtual report
> +
> +@r1@
> +position p;
> +@@
> + devm_platform_ioremap_resource(...) {
> +	...
> +	devm_platform_get_and_ioremap_resource@p(...)
> +	...
> + }
> +
> +@...ends on patch@
> +expression pdev,index;
> +position p != r1.p;
> +@@
> +
> +-  devm_platform_get_and_ioremap_resource@p(pdev, index, NULL)
> ++  devm_platform_ioremap_resource(pdev, index)
> +
> +@r2 depends on !patch exists@
> +expression pdev,index;
> +position p;
> +@@
> +
> +*  devm_platform_get_and_ioremap_resource@p(pdev, index, NULL)
> +
> +@...ipt:python depends on org@
> +p << r2.p;
> +@@
> +
> +cocci.print_main("WARNING opportunity for devm_platform_ioremap_resource", p)
> +
> +@...ipt:python depends on report@
> +p << r2.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING opportunity for devm_platform_ioremap_resource")
> --
> 2.38.1
>
>