linux-kernel - Re: [PATCH v2 1/2] i2c: designware: Correct length byte validation logic

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Message-ID: <ZNosPK3M4/bZ0vc9@shikoro>
Date:   Mon, 14 Aug 2023 15:29:32 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Tam Nguyen <tamnguyenchi@...amperecomputing.com>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        patches@...erecomputing.com, jarkko.nikula@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, mika.westerberg@...ux.intel.com,
        jsd@...ihalf.com, chuong@...amperecomputing.com,
        darren@...amperecomputing.com,
        Quan Nguyen <quan@...amperecomputing.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] i2c: designware: Correct length byte validation
 logic

On Wed, Jul 26, 2023 at 03:00:00PM +0700, Tam Nguyen wrote:
> From: Quan Nguyen <quan@...amperecomputing.com>
> 
> Commit 0daede80f870 ("i2c: designware: Convert driver to using regmap API")
> changes the logic to validate the whole 32-bit return value of
> DW_IC_DATA_CMD register instead of 8-bit LSB without reason.
> 
> Later, commit f53f15ba5a85 ("i2c: designware: Get right data length"),
> introduced partial fix but not enough because the "tmp > 0" still test
> tmp as 32-bit value and is wrong in case the IC_DATA_CMD[11] is set.
> 
> Revert the logic to just before commit 0daede80f870
> ("i2c: designware: Convert driver to using regmap API").
> 
> Fixes: f53f15ba5a85 ("i2c: designware: Get right data length")
> Fixes: 0daede80f870 ("i2c: designware: Convert driver to using regmap API")
> Cc: stable@...r.kernel.org
> Signed-off-by: Tam Nguyen <tamnguyenchi@...amperecomputing.com>
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>

Applied to for-current, thanks!


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