linux-kernel - Re: [PATCH] isdn divas: fix proc creation

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Date:	Thu, 5 Jun 2008 12:25:06 +0200 (CEST)
From:	Armin Schindler <armin@...ware.de>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] isdn divas: fix proc creation

On Sat, 31 May 2008, Alexey Dobriyan wrote:
> 1. creating proc entry and not saving pointer to PDE and checking it
>   is not going to work.

I don't know where you found this. I have look even in older versions, but
the pointer divas_proc_entry is set by proc_create(). The patch to
divasproc.c is wrong, it exists from the beginning of the driver.
(2.6.25.4 doesn't contain the bug you describe).

> 2. if proc entry wasn't created, no reason to remove it on error path.

Agreed here. The reason for doing remove_divas_proc() anyway, was to
make sure all possible settings done in !create_divas_proc() are
reverted. But since nothing else is done here, it is okay to remove it.

Armin

> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
>
> drivers/isdn/hardware/eicon/divasmain.c |    1 -
> drivers/isdn/hardware/eicon/divasproc.c |    4 ++--
> 2 files changed, 2 insertions(+), 3 deletions(-)
>
> --- a/drivers/isdn/hardware/eicon/divasmain.c
> +++ b/drivers/isdn/hardware/eicon/divasmain.c
> @@ -806,7 +806,6 @@ static int DIVA_INIT_FUNCTION divas_init(void)
>
> 	if (!create_divas_proc()) {
> #ifdef MODULE
> -		remove_divas_proc();
> 		divas_unregister_chrdev();
> 		divasfunc_exit();
> #endif
> --- a/drivers/isdn/hardware/eicon/divasproc.c
> +++ b/drivers/isdn/hardware/eicon/divasproc.c
> @@ -125,8 +125,8 @@ static const struct file_operations divas_fops = {
>
> int create_divas_proc(void)
> {
> -	proc_create(divas_proc_name, S_IFREG | S_IRUGO, proc_net_eicon,
> -		    &divas_fops);
> +	divas_proc_entry = proc_create(divas_proc_name, S_IFREG | S_IRUGO,
> +					proc_net_eicon, &divas_fops);
> 	if (!divas_proc_entry)
> 		return (0);
>
>
> --
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