netdev - Re: [PATCH net-next] net: stmmac: Simplify mtl IRQ status checking

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Message-ID: <871q9n81s1.fsf@kurt.kurt.home>
Date: Thu, 08 Feb 2024 15:32:30 +0100
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Yannick
 Vignon <yannick.vignon@....com>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next] net: stmmac: Simplify mtl IRQ status checking

On Thu Feb 08 2024, Maciej Fijalkowski wrote:
> On Thu, Feb 08, 2024 at 11:35:25AM +0100, Kurt Kanzenbach wrote:
>> Commit 8a7cb245cf28 ("net: stmmac: Do not enable RX FIFO overflow
>> interrupts") disabled the RX FIFO overflow interrupts. However, it left the
>> status variable around, but never checks it.
>> 
>> As stmmac_host_mtl_irq_status() returns only 0 now, the code can be
>> simplified.
>> 
>> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
>> ---
>>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 04d817dc5899..10ce2f272b62 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -6036,10 +6036,8 @@ static void stmmac_common_interrupt(struct stmmac_priv *priv)
>>  				priv->tx_path_in_lpi_mode = false;
>>  		}
>>  
>> -		for (queue = 0; queue < queues_count; queue++) {
>> -			status = stmmac_host_mtl_irq_status(priv, priv->hw,
>> -							    queue);
>> -		}
>> +		for (queue = 0; queue < queues_count; queue++)
>> +			stmmac_host_mtl_irq_status(priv, priv->hw, queue);
>
> Hey Kurt,
>
> looks to me that all of the current callbacks just return 0 so why not
> make them return void instead?

Well, there are two callbacks of this in dwmac4 and dwxgmac2. Both of
them still have the code for handling the overflow interrupt (and then
returning != 0). However, as of commit 8a7cb245cf28 the interrupt
shouldn't fire. So yes, it could be changed to void along with some
code removal. But, maybe i'm missing something.

Thanks,
Kurt

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