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

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Message-ID: <ca1b9134-1e5a-ea83-146f-693ba38be413@pengutronix.de>
Date:   Thu, 8 Feb 2018 22:33:54 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Marek Vasut <marex@...x.de>, 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,
        Wolfgang Grandegger <wg@...ndegger.com>
Subject: Re: [PATCH v2 1/2] net, can, ifi: fix "write buffer full" error

On 02/08/2018 08:22 PM, Marek Vasut wrote:
> On 02/08/2018 03:46 PM, Marc Kleine-Budde wrote:
>> 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.
> 
> Can you also apply them to stable, so they get into 4.9.x etc ?

I've already added stable on Cc, so they will be picked up by the stable
maintainers.

Marc

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Pengutronix e.K.                  | Marc Kleine-Budde           |
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