linux-kernel - Re: [PATCH 1/2] staging: vme_user: add list_del in the error handling of tsi148_dma_list

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Message-ID: <7bf2977b-b3a9-0543-0a41-dd4ad03e1594@wanadoo.fr>
Date:   Sat, 26 Nov 2022 16:31:53 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Dongliang Mu <dzm91@...t.edu.cn>,
        Martyn Welch <martyn@...chs.me.uk>,
        Manohar Vanga <manohar.vanga@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mingyi Kang <jerrykang026@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 1/2] staging: vme_user: add list_del in the error handling
 of tsi148_dma_list_add

Le 26/11/2022 à 13:56, Dongliang Mu a écrit :
> Smatch reports the following issue:
> drivers/staging/vme_user/vme_tsi148.c:1757 tsi148_dma_list_add()
> warn: '&entry->list' not removed from list
> 

Hi,

Not tested with smatch, but I think that moving the list_add_tail() call 
just a few lines below, when all lights are green, would also fix the issue.

Just my 2c,

CJ


> Fix this by adding list_del in the error handling code.
> 
> Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
> ---
>   drivers/staging/vme_user/vme_tsi148.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/vme_user/vme_tsi148.c b/drivers/staging/vme_user/vme_tsi148.c
> index 020e0b3bce64..0171f46d1848 100644
> --- a/drivers/staging/vme_user/vme_tsi148.c
> +++ b/drivers/staging/vme_user/vme_tsi148.c
> @@ -1751,6 +1751,7 @@ static int tsi148_dma_list_add(struct vme_dma_list *list,
>   	return 0;
>   
>   err_dma:
> +	list_del(&entry->list);
>   err_dest:
>   err_source:
>   err_align: