linux-kernel - Re: [PATCH 1/1 v2] driver:mtd:spi-nor:fix spi_nor

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Date:	Wed, 15 Oct 2014 00:45:53 +0200
From:	Marek Vasut <marex@...x.de>
To:	"Bean Huo 霍斌斌 (beanhuo)" 
	<beanhuo@...ron.com>
Cc:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"shijie8@...il.com" <shijie8@...il.com>,
	"geert+renesas@...der.be" <geert+renesas@...der.be>,
	"grmoore@...era.com" <grmoore@...era.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1 v2] driver:mtd:spi-nor:fix spi_nor_scan overwrite platform ID point

On Tuesday, October 14, 2014 at 03:26:49 AM, Bean Huo 霍斌斌 (beanhuo) wrote:
[...]

> -			dev_warn(dev, "found %s, expected %s\n",
> -				 jid->name, id->name);
> -			id = jid;
> -			info = (void *)jid->driver_data;
> +			struct flash_info *tmpinfo;
> +
> +			tmpinfo = (void *)jid->driver_data;
> +			if (tmpinfo->jedec_id != info->jedec_id ||
> +					(info->ext_id != 0 &&
> +					 tmpinfo->ext_id != info->ext_id)) {
> +				dev_warn(dev, "found %s, expected %s\n",
> +						jid->name, id->name);
> +				id = jid;
> +				info = (void *)jid->driver_data;
> +			}

Won't $info contain an undefined value in case the newly added condition isn't 
met ? The old code initialized $info to a certain value always, the new code 
does not do that.

Best regards,
Marek Vasut
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