linux-kernel - Re: [RESEND, 1/4] i2c: mpc: get MPC8xxx I2C clock prescaler before using it in calculations

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Date:   Sat, 30 Dec 2017 19:18:14 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Arseny Solokha <asolokha@...kras.ru>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Valentin Longchamp <valentin.longchamp@...mile.com>
Subject: Re: [RESEND, 1/4] i2c: mpc: get MPC8xxx I2C clock prescaler before
 using it in calculations

On Thu, Dec 07, 2017 at 05:20:00PM +0700, Arseny Solokha wrote:
> Obtaining the actual I2C clock prescaler value in mpc_i2c_setup_8xxx() only
> happens when the clock parameter is set to something other than
> MPC_I2C_CLOCK_LEGACY. When the clock parameter is exactly
> MPC_I2C_CLOCK_LEGACY, the prescaler parameter is used in arithmetic
> division as provided by the caller, resulting in a division by zero
> for the majority of processors supported by the module.
> 
> Avoid division by zero by obtaining the actual I2C clock prescaler
> in mpc_i2c_setup_8xxx() unconditionally regardless of the passed clock
> value.
> 
> Signed-off-by: Arseny Solokha <asolokha@...kras.ru>

Applied to for-current, thanks!


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