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Date:   Wed, 30 Aug 2017 16:27:41 +0200
From:   Thierry Reding <>
To:     Derek Basehore <>
Subject: Re: [PATCH v2] pwm_bl: Fix overflow condition

On Tue, Aug 29, 2017 at 01:34:34PM -0700, Derek Basehore wrote:
> This fixes an overflow condition that can happen with high max
> brightness and period values in compute_duty_cycle. This fixes it by
> using a 64 bit variable for computing the duty cycle.
> Signed-off-by: Derek Basehore <>
> ---
>  drivers/video/backlight/pwm_bl.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

I'm still confused by the brightness-levels-scale comment in the other
thread, but this looks like a good fix for a potential overflow so:

Acked-by: Thierry Reding <>

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