linux-kernel - Re: [PATCH] staging: mt7621-pinctrl: Remove space after cast

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Message-ID: <b51b1d3071aec95915d48159c1dd6e0a336cd9f4.camel@perches.com>
Date:   Wed, 23 Jan 2019 09:45:53 -0800
From:   Joe Perches <joe@...ches.com>
To:     Nishad Kamdar <nishadkamdar@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     NeilBrown <neil@...wn.name>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Kees Cook <keescook@...omium.org>,
        John Crispin <blogic@...nwrt.org>, devel@...verdev.osuosl.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: mt7621-pinctrl: Remove space after cast

On Wed, 2019-01-23 at 22:01 +0530, Nishad Kamdar wrote:
> This patch removes space after a cast as it
> is not needed.
> Issue found by checkpatch.
> 
> Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> ---
>  drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
> index 80e7067cfb79..3e959fa73703 100644
> --- a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
> +++ b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
> @@ -363,7 +363,7 @@ static int rt2880_pinmux_probe(struct platform_device *pdev)
>  		}
>  
>  		range = devm_kzalloc(p->dev, sizeof(*range) + 4, GFP_KERNEL);
> -		range->name = name = (char *) &range[1];
> +		range->name = name = (char *)&range[1];
>  		sprintf(name, "pio");

I find this code unsightly and fragile.
It doesn't test the return of devm_kzalloc for failure.

This might as well be
---
 drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
index 80e7067cfb79..9b52d44abef1 100644
--- a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
+++ b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
@@ -350,7 +350,6 @@ static int rt2880_pinmux_probe(struct platform_device *pdev)
 	for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
 		const __be32 *ngpio, *gpiobase;
 		struct pinctrl_gpio_range *range;
-		char *name;
 
 		if (!of_device_is_available(np))
 			continue;
@@ -362,9 +361,10 @@ static int rt2880_pinmux_probe(struct platform_device *pdev)
 			return -EINVAL;
 		}
 
-		range = devm_kzalloc(p->dev, sizeof(*range) + 4, GFP_KERNEL);
-		range->name = name = (char *) &range[1];
-		sprintf(name, "pio");
+		range = devm_kzalloc(p->dev, sizeof(*range), GFP_KERNEL);
+		if (!range)
+			return -ENOMEM;
+		range->name = "pio";
 		range->npins = __be32_to_cpu(*ngpio);
 		range->base = __be32_to_cpu(*gpiobase);
 		range->pin_base = range->base;