linux-kernel - Re: [PATCH v2] i2c: xlp9xx: Fix case where SSIF read transaction completes early

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Message-ID: <20180809153959.y6su5kxnwilkdhlz@ninjato>
Date:   Thu, 9 Aug 2018 17:39:59 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     George Cherian <george.cherian@...ium.com>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        jglauber@...ium.com
Subject: Re: [PATCH v2] i2c: xlp9xx: Fix case where SSIF read transaction
 completes early

On Wed, Aug 08, 2018 at 11:36:48PM -0700, George Cherian wrote:
> During ipmi stress tests we see occasional failure of transactions
> at the boot time. This happens in the case of a I2C_M_RECV_LEN
> transactions, when the read transfer completes (with the initial
> read length of 34) before the driver gets a chance to handle interrupts.
> 
> The current driver code expects at least 2 interrupts for I2C_M_RECV_LEN
> transactions. The length is updated during the first interrupt, and  the
> buffer contents are only copied during subsequent interrupts. In case of
> just one interrupt, we will complete the transaction without copying
> out the bytes from RX fifo.
> 
> Update the code to drain the RX fifo after the length update,
> so that the transaction completes correctly in all cases.
> 
> Signed-off-by: George Cherian <george.cherian@...ium.com>

Applied to for-current, thanks!


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