linux-kernel - Re: [bug report] phy: apple: Add Apple Type-C PHY

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Message-ID: <20260206214743.GA194367@robin.jannau.net>
Date: Fri, 6 Feb 2026 22:47:43 +0100
From: Janne Grunau <j@...nau.net>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Sven Peter <sven@...nel.org>, Neal Gompa <neal@...pa.dev>,
	Neil Armstrong <neil.armstrong@...aro.org>, asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-phy@...ts.infradead.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [bug report] phy: apple: Add Apple Type-C PHY

On Fri, Feb 06, 2026 at 04:40:47PM +0300, Dan Carpenter wrote:
> [ Smatch checking is paused while we raise funding.  #SadFace
>   https://lore.kernel.org/all/aTaiGSbWZ9DJaGo7@stanley.mountain/ -dan ]

This is unfortunate, there have been useful bug reports.

> Commit 8e98ca1e74db ("phy: apple: Add Apple Type-C PHY") from Dec 14,
> 2025 (linux-next), leads to the following Smatch static checker
> warning:
> 
> 	drivers/phy/apple/atc.c:2209 atcphy_map_resources()
> 	warn: 'resources[i]->addr' isn't an ERR_PTR
> 
> drivers/phy/apple/atc.c
>     2191 static int atcphy_map_resources(struct platform_device *pdev, struct apple_atcphy *atcphy)
>     2192 {
>     2193         struct {
>     2194                 const char *name;
>     2195                 void __iomem **addr;
>     2196                 struct resource **res;
>     2197         } resources[] = {
>     2198                 { "core", &atcphy->regs.core, &atcphy->res.core },
>     2199                 { "lpdptx", &atcphy->regs.lpdptx, NULL },
>     2200                 { "axi2af", &atcphy->regs.axi2af, &atcphy->res.axi2af },
>     2201                 { "usb2phy", &atcphy->regs.usb2phy, NULL },
>     2202                 { "pipehandler", &atcphy->regs.pipehandler, NULL },
>     2203         };
>     2204         struct resource *res;
>     2205 
>     2206         for (int i = 0; i < ARRAY_SIZE(resources); i++) {
>     2207                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, resources[i].name);
>     2208                 *resources[i].addr = devm_ioremap_resource(&pdev->dev, res);
> --> 2209                 if (IS_ERR(resources[i].addr))
> 
> This is checking the wrong variable.  The * is missing.
> if (IS_ERR(*resources[i].addr)) {

This issue was identified by testing and is fixed in next by commit
7d55b44e2be1 ("phy: apple: atc: Actually check return value of
devm_apple_tunable_parse").

https://lore.kernel.org/all/20260104-atcphy-tunable-fix-v2-1-84e5c2a57aaa@kernel.org/

Thanks for the report

Janne