linux-kernel - Re: [PATCH 6/6] serial: stm32: synchronize RX DMA channel in shutdown

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Message-ID: <2023080414-props-senior-c40a@gregkh>
Date:   Fri, 4 Aug 2023 15:05:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Valentin Caron <valentin.caron@...s.st.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/6] serial: stm32: synchronize RX DMA channel in shutdown

On Thu, Aug 03, 2023 at 03:01:34PM +0200, Valentin Caron wrote:
> From: Amelie Delaunay <amelie.delaunay@...s.st.com>
> 
> In shutdown, RX DMA channel is terminated. If the DMA RX callback is
> scheduled but not yet executed, while a new RX DMA transfer is started, the
> callback can be executed, and then disturb the ongoing RX DMA transfer.
> To avoid such a case, call dmaengine_synchronize in shutdown, after the
> DMA RX channel is terminated.
> 
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
> ---

You can't forward on a patch from someone else and not sign-off on it
yourself :(

Please fix up and resend the series.

thanks,

greg k-h