linux-kernel - Re: [PATCH] Initialise scatter/gather list in sg driver

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Message-ID: <20071026115958.GK5155@kernel.dk>
Date:	Fri, 26 Oct 2007 13:59:58 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Initialise scatter/gather list in sg driver

On Thu, Oct 25 2007, Anton Blanchard wrote:
> 
> After turning on DEBUG_SG I hit a fail:
> 
> kernel BUG at include/linux/scatterlist.h:50!
> 
> 	sg_build_indirect
> 	sg_build_reserve
> 	sg_open
> 	chrdev_open
> 	__dentry_open
> 	do_filp_open
> 	do_sys_open
> 
> We should initialise the sg list when we allocate it in sg_build_sgat.
> 
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
> 
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index b5fa4f0..f1871ea 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -1652,6 +1652,7 @@ sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
>  	schp->buffer = kzalloc(sg_bufflen, gfp_flags);
>  	if (!schp->buffer)
>  		return -ENOMEM;
> +	sg_init_table(schp->buffer, tablesize);
>  	schp->sglist_len = sg_bufflen;
>  	return tablesize;	/* number of scat_gath elements allocated */
>  }

Thanks, applied!

-- 
Jens Axboe

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