netdev - Re: [PATCH v3 net-next 2/2] net: ethernet: mtk_wed: fix possible deadlock if mtk_wed_wo

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Date:   Thu, 8 Dec 2022 10:44:31 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, matthias.bgg@...il.com,
        linux-mediatek@...ts.infradead.org, lorenzo.bianconi@...hat.com,
        sujuan.chen@...iatek.com
Subject: Re: [PATCH v3 net-next 2/2] net: ethernet: mtk_wed: fix possible
 deadlock if mtk_wed_wo_init fails

On Wed, Dec 07, 2022 at 03:04:55PM +0100, Lorenzo Bianconi wrote:
> Introduce __mtk_wed_detach() in order to avoid a deadlock in
> mtk_wed_attach routine if mtk_wed_wo_init fails since both
> mtk_wed_attach and mtk_wed_detach run holding hw_lock mutex.
> 
> Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/ethernet/mediatek/mtk_wed.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
> index 4ef23eadd69e..a6271449617f 100644
> --- a/drivers/net/ethernet/mediatek/mtk_wed.c
> +++ b/drivers/net/ethernet/mediatek/mtk_wed.c
> @@ -577,12 +577,10 @@ mtk_wed_deinit(struct mtk_wed_device *dev)
>  }
>  

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>