linux-kernel - Re: [PATCH] Fix pointer arithmetic in hpt3xx driver code

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Message-ID: <48C1749E.6050002@ru.mvista.com>
Date:	Fri, 05 Sep 2008 22:04:14 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Masoud Sharbiani <masouds@...gle.com>
Cc:	bzolnier@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix pointer arithmetic in hpt3xx driver code

Masoud Sharbiani wrote:

> Hi there,
> git commit 74811f355f4f69a187fa74892dcf2a684b84ce99 causes crash at
> module load (or boot) time on my machine with a hpt374 controller.
> Sergei says this is due to the pointer arithmatic. This patch fixes that
> and makes my machine boot again.

> Signed-Off-By: Masoud Sharbiani <masouds@...gle.com>

> diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
> index eb107ee..f41f3fd 100644
> --- a/drivers/ide/pci/hpt366.c
> +++ b/drivers/ide/pci/hpt366.c
> @@ -613,6 +613,14 @@ static int check_in_drive_list(ide_drive_t *drive, const char **list)
>  	return 0;
>  }

> +static struct hpt_info *hpt3xx_get_info(void *host_priv, struct device *hwif_dev, struct device *host_dev)

    Ugh, that's oversimplified and doesn't save much...
    I rather meant the following prototype:

static struct hpt_info *hpt3xx_get_info(struct pci_dev *dev)

In case it'll be too complex for you, I'll do it myself later.

> +{
> +	struct hpt_info *info = (struct hpt_info *)host_priv;

    Newline needed after the declaration block.

> +	if (hwif_dev == host_dev)
		return info + 1;
	else
		return info;

or

	return hwif_dev == host_dev ? info + 1 : info;

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