netdev - Re: [PATCH net] net: airoha: Fix schedule while atomic in airoha_ppe

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Message-ID: <20260104095748.70107b9b@kernel.org>
Date: Sun, 4 Jan 2026 09:57:48 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH net] net: airoha: Fix schedule while atomic in
 airoha_ppe_deinit()

On Tue, 23 Dec 2025 22:56:44 +0100 Lorenzo Bianconi wrote:
> Rely on rcu_replace_pointer in airoha_ppe_deinit routine in order to fix
> schedule while atomic issue.

The information in the commit message is not sufficient.
What "schedule while atomic issue"?

> -	npu = rcu_dereference(eth->npu);
> +	mutex_lock(&flow_offload_mutex);
> +
> +	npu = rcu_replace_pointer(eth->npu, NULL,
> +				  lockdep_is_held(&flow_offload_mutex));
>  	if (npu) {
>  		npu->ops.ppe_deinit(npu);
>  		airoha_npu_put(npu);
-- 
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