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From:   Kalle Valo <kvalo@kernel.org>
To:     Youghandhar Chintala <quic_youghand@quicinc.com>
Cc:     <ath10k@lists.infradead.org>, <linux-wireless@vger.kernel.org>,
        Douglas Anderson <dianders@chromium.org>
Subject: Re: [PATCH] wifi: ath10k: Delay the unmapping of the buffer
References: <20220816044310.19101-1-quic_youghand@quicinc.com>
Date:   Tue, 11 Oct 2022 12:08:36 +0300
In-Reply-To: <20220816044310.19101-1-quic_youghand@quicinc.com> (Youghandhar
        Chintala's message of "Tue, 16 Aug 2022 10:13:10 +0530")
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Youghandhar Chintala <quic_youghand@quicinc.com> writes:

> We are seeing a corner case where host receiving copy completion for WMI
> command though copy engine is processing it. Once host receives the
> copy completion, host is unmapping corresponding memory which results
> in SMMU fault. To avoid such conditions though host receives copy
> completion, as a work around we are adding a delay to unmap the memory
> for WMI end point.
>
> Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.2.0-01387-QCAHLSWMTPLZ-1
>
> Tested-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Youghandhar Chintala <quic_youghand@quicinc.com>

Please describe the actual bug in more detail (symptoms etc). Basically
I would like to see information so that if there's a bug report I can
easily pinpoint that this patch fixes it. Currently I have no idea how
this bug affects the users.

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