linux-kernel - Re: [PATCH 1/3] POWERPC: don't cast a pointer to pointer of list

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Message-Id: <200712071507.10161.nickpiggin@yahoo.com.au>
Date:	Fri, 7 Dec 2007 15:07:09 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	paulus@...ba.org, LKML <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...abs.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] POWERPC: don't cast a pointer to pointer of list_head

On Thursday 06 December 2007 20:33, Li Zefan wrote:
> The casting is safe only when the list_head member is the
> first member of the structure.

Even so, I don't think too safe :) It might technically work,
but it could break more easily.

So even if you find places where list_head is the first member of
a structure, it would be nice to explicitly use the list_head member
and avoid casts IMO.

Thanks,
Nick

> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>
> ---
>  arch/ppc/syslib/ocp.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/ppc/syslib/ocp.c b/arch/ppc/syslib/ocp.c
> index 3f5be2c..d42d408 100644
> --- a/arch/ppc/syslib/ocp.c
> +++ b/arch/ppc/syslib/ocp.c
> @@ -376,7 +376,7 @@ ocp_remove_one_device(unsigned int vendor, unsigned int
> function, int index)
>
>  	down_write(&ocp_devices_sem);
>  	dev = __ocp_find_device(vendor, function, index);
> -	list_del((struct list_head *)dev);
> +	list_del(&dev->link);
>  	up_write(&ocp_devices_sem);
>
>  	DBG(("ocp: ocp_remove_one_device(vendor: %x, function: %x, index: %d)...
> done.\n", vendor, function, index));
--
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