netdev - Re: [PATCH] ks8851: Fix deadlock with the SPI chip variant

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Message-ID: <20240704074407.4cb4ebdf@kernel.org>
Date: Thu, 4 Jul 2024 07:44:07 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Ronald Wahl <rwahl@....de>
Cc: Ronald Wahl <ronald.wahl@...itan.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] ks8851: Fix deadlock with the SPI chip variant

On Wed,  3 Jul 2024 18:00:53 +0200 Ronald Wahl wrote:
> +		bool need_wake_queue;
> 
>  		netif_dbg(ks, intr, ks->netdev,
>  			  "%s: txspace %d\n", __func__, tx_space);
> 
>  		spin_lock(&ks->statelock);
>  		ks->tx_space = tx_space;
> -		if (netif_queue_stopped(ks->netdev))
> -			netif_wake_queue(ks->netdev);
> +		need_wake_queue = netif_queue_stopped(ks->netdev);
>  		spin_unlock(&ks->statelock);
> +		if (need_wake_queue)
> +			netif_wake_queue(ks->netdev);

xmit runs in BH, this is just one way you can hit this deadlock
better fix would be to make sure statelock is always taken
using spin_lock_bh()
-- 
pw-bot: cr