linux-kernel - Re: [PATCH] input: fix odd_ptr

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Date:	Wed, 17 Feb 2016 13:55:11 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Julia Lawall <julia.lawall@...6.fr>,
	Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>,
	Scott Branden <scott.branden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org,
	Jonathan Richardson <jonathar@...adcom.com>,
	Ray Jui <ray.jui@...adcom.com>, kbuild-all@...org,
	linux-input@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH] input: fix odd_ptr_err.cocci warnings

On Wednesday 17 February 2016 07:29:05 Julia Lawall wrote:
> PTR_ERR should access the value just tested by IS_ERR
> 
> Generated by: scripts/coccinelle/tests/odd_ptr_err.cocci
> 
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
> ---
> 
> I haven't checked the context in detail. There can be false positives,
> when it is the call to IS_ERR that is wrong.
> 
> tree:   https://github.com/Broadcom/arm64-linux iproc-tsc-v2
> head:   ef32cf1baeb934bfcdf7c9eb8ad345aae266cde5
> commit: c3afc7a1c330ce452c52e2183a23b2ab9f70bd4a [2/3] input: syscon
> support in bcm_iproc_tsc driver
> 
> Please take the patch only if it's a positive warning. Thanks!
> 
> 

Looks correct to me

Reviewed-by: Arnd Bergmann <arnd@...db.de>

>                 if (IS_ERR(priv->regmap)) {
> -                       error = PTR_ERR(priv->regs);
> +                       error = PTR_ERR(priv->regmap);

I think this could have been avoided using

		error = PTR_ERR_OR_ZERO(priv->regmap);
		if (error) {
			...

	Arnd