linux-kernel - Re: [PATCH] ide: fix crash at boot with siimage driver

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Date:	Tue, 29 Apr 2008 19:01:32 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	benh@...nel.crashing.org
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	list linux-ide <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ide: fix crash at boot with siimage driver

Hello.

Benjamin Herrenschmidt wrote:

> Some change to the IDE layer are causing the siimage driver to crash
> at boot with a NULL dereference. This is due to the sil_dma_ops not
> containing all the necessary pointers. I suppose it used to just
> "override" the defaults while now, it needs to contain everything.

    Both the patch introducing 'struct ide_dma_ops' into drivers and making 
them 'const' were in the same batch. However, the latter patch (now commit 
f37afdaca711838b50ecd89b9c15fc745270d77c) erroneously missed siimage.c -- 
which I didn't notice when reviewing, sigh...

> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---

> Index: linux-work/drivers/ide/pci/siimage.c
> ===================================================================
> --- linux-work.orig/drivers/ide/pci/siimage.c	2008-04-29 14:44:37.000000000 +1000
> +++ linux-work/drivers/ide/pci/siimage.c	2008-04-29 14:44:44.000000000 +1000
> @@ -780,7 +780,14 @@ static const struct ide_port_ops sil_sat
>  };
>  
>  static struct ide_dma_ops sil_dma_ops = {

    Could you please make this 'const' -- the same way as the mentioned commit 
does in other drivers?

> +	.dma_host_set		= ide_dma_host_set,
> +	.dma_setup		= ide_dma_setup,
> +	.dma_exec_cmd		= ide_dma_exec_cmd,
> +	.dma_start		= ide_dma_start,
> +	.dma_end		= __ide_dma_end,
>  	.dma_test_irq		= siimage_dma_test_irq,
> +	.dma_timeout		= ide_dma_timeout,
> +	.dma_lost_irq		= ide_dma_lost_irq,
>  };
>  
>  #define DECLARE_SII_DEV(name_str, p_ops)		\

MBR, Sergei
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