linux-kernel - Re: [PATCH net v2] net: stmmac: xgmac: fix handling of DPP safety error for DMA channels

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Date: Tue, 30 Jan 2024 12:40:59 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Furong Xu <0x1207@...il.com>, "David S. Miller" <davem@...emloft.net>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, Eric Dumazet <edumazet@...gle.com>,  Jakub Kicinski
 <kuba@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Joao Pinto
 <jpinto@...opsys.com>, Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	xfr@...look.com, rock.xu@....com
Subject: Re: [PATCH net v2] net: stmmac: xgmac: fix handling of DPP safety
 error for DMA channels

On Fri, 2024-01-26 at 15:39 +0800, Furong Xu wrote:
> @@ -914,7 +964,12 @@ static int dwxgmac3_safety_feat_irq_status(struct net_device *ndev,
>  		ret |= !corr;
>  	}
>  
> -	err = dma & (XGMAC_DEUIS | XGMAC_DECIS);
> +	/* DMA_DPP_Interrupt_Status is indicated by MCSIS bit in
> +	 * DMA_Safety_Interrupt_Status, so we handle DMA Data Path
> +	 * Parity Errors here
> +	 */
> +	err = (dma & (XGMAC_DEUIS | XGMAC_DECIS)) ||
> +	      (dma & XGMAC_MCSIS);

The above syntax is IMHO confusing, 

	err = (dma & (XGMAC_DEUIS | XGMAC_DECIS | XGMAC_MCSIS))

should be more readable.

Cheers,

Paolo