linux-kernel - Re: [PATCH] mtd: nand: omap2: add missing braces

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Date:	Thu, 14 Jul 2016 15:04:32 +0200
From:	Teresa Remmet <t.remmet@...tec.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	Roger Quadros <rogerq@...com>,
	Tony Lindgren <tony@...mide.com>,
	"Cooper Jr., Franklin" <fcooper@...com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand: omap2: add missing braces

Hello,

Am Donnerstag, den 14.07.2016, 11:53 +0200 schrieb Arnd Bergmann:
> A bug fix just introduced incorrect behavior in the omap2 nand driver, as
> found by gcc-6.1:
> 
> drivers/mtd/nand/omap2.c: In function 'omap_get_dt_info':
> drivers/mtd/nand/omap2.c:1658:2: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
>   if (!info->elm_of_node)
>   ^~
> drivers/mtd/nand/omap2.c:1660:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
>    if (!info->elm_of_node)
>    ^~
> 
> We clearly need to put the indented code into { } braces to get the intended
> behavior.

how bad that I missed that :(.
But nice that gcc-6.1 catches such things.

Thanks,
Teresa

> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 3bbca2c54f86 ("mtd: nand: omap2: Add check for old elm binding")
> ---
>  drivers/mtd/nand/omap2.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index a36ad3d146a3..ab7c34096a62 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1655,10 +1655,11 @@ static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info)
>  
>  	/* detect availability of ELM module. Won't be present pre-OMAP4 */
>  	info->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0);
> -	if (!info->elm_of_node)
> +	if (!info->elm_of_node) {
>  		info->elm_of_node = of_parse_phandle(child, "elm_id", 0);
>  		if (!info->elm_of_node)
>  			dev_dbg(dev, "ti,elm-id not in DT\n");
> +	}
>  
>  	/* select ecc-scheme for NAND */
>  	if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) {