linux-kernel - Re: [PATCH v2 1/2] net, can, ifi: fix "write buffer full" error

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Message-ID: <59322f7d-4207-a5a4-89b5-dff1634e4183@pengutronix.de>
Date:   Thu, 8 Feb 2018 15:46:27 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Heiko Schocher <hs@...x.de>, linux-can@...r.kernel.org
Cc:     Markus Marb <markus@...b.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Marek Vasut <marex@...x.de>,
        Wolfgang Grandegger <wg@...ndegger.com>
Subject: Re: [PATCH v2 1/2] net, can, ifi: fix "write buffer full" error

On 02/08/2018 07:47 AM, Heiko Schocher wrote:
> the driver reads in the ISR first the IRQpending register,
> and clears after that in a write *all* bits in it.
> 
> It could happen that the isr register raise bits between
> this 2 register accesses, which leads in lost bits ...
> 
> In case it clears "TX message sent successfully", the driver
> never sends any Tx data, and buffers to userspace run over.
> 
> Fixed this:
> clear only the bits in the IRQpending register, the
> driver had read.
> 
> Signed-off-by: Heiko Schocher <hs@...x.de>
> Reviewed-by: Marek Vasut <marex@...x.de>

Applied both to linux-can.

Tnx,
Marc

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