linux-kernel - Re: [PATCH net 2/2] net: ipa: prevent concurrent replenish

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Date:   Tue, 11 Jan 2022 13:54:23 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Alex Elder <elder@...aro.org>
Cc:     davem@...emloft.net, kuba@...nel.org, jponduru@...eaurora.org,
        avuyyuru@...eaurora.org, bjorn.andersson@...aro.org,
        agross@...nel.org, cpratapa@...eaurora.org,
        subashab@...eaurora.org, evgreen@...omium.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: ipa: prevent concurrent replenish

On Tue, Jan 11, 2022 at 01:21:50PM -0600, Alex Elder wrote:
> We have seen cases where an endpoint RX completion interrupt arrives
> while replenishing for the endpoint is underway.  This causes another
> instance of replenishing to begin as part of completing the receive
> transaction.  If this occurs it can lead to transaction corruption.
> 
> Use a new atomic variable to ensure only replenish instance for an
> endpoint executes at a time.
> 
> Fixes: 84f9bd12d46db ("soc: qcom: ipa: IPA endpoints")
> Signed-off-by: Alex Elder <elder@...aro.org>

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>