linux-kernel - Re: [PATCH net v2 1/2] net: ethernet: oa_tc6: fix infinite loop error when tx credits becomes 0

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Message-ID: <b48da380-3071-4a94-911d-8d742d9120c2@redhat.com>
Date: Tue, 26 Nov 2024 11:44:38 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>,
 andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 UNGLinuxDriver@...rochip.com, jacob.e.keller@...el.com
Subject: Re: [PATCH net v2 1/2] net: ethernet: oa_tc6: fix infinite loop error
 when tx credits becomes 0

On 11/22/24 11:21, Parthiban Veerasooran wrote:
> SPI thread wakes up to perform SPI transfer whenever there is an TX skb
> from n/w stack or interrupt from MAC-PHY. Ethernet frame from TX skb is
> transferred based on the availability tx credits in the MAC-PHY which is
> reported from the previous SPI transfer. Sometimes there is a possibility
> that TX skb is available to transmit but there is no tx credits from
> MAC-PHY. In this case, there will not be any SPI transfer but the thread
> will be running in an endless loop until tx credits available again.
> 
> So checking the availability of tx credits along with TX skb will prevent
> the above infinite loop. When the tx credits available again that will be
> notified through interrupt which will trigger the SPI transfer to get the
> available tx credits.
> 
> Fixes: 53fbde8ab21e ("net: ethernet: oa_tc6: implement transmit path to transfer tx ethernet frames")
> 
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>

Please, avoid empty lines between the Fixes tag and the SoB

Thanks,

Paolo