linux-kernel - Re: [PATCH 2/2] clocksource: timer-dm: Check prescaler value

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Date:   Tue, 19 Dec 2017 14:00:52 +0530
From:   Keerthy <j-keerthy@...com>
To:     Ladislav Michl <ladis@...ux-mips.org>
CC:     <daniel.lezcano@...aro.org>, <tony@...mide.com>,
        <aaro.koskinen@....fi>, <thierry.reding@...il.com>,
        <grygorii.strashko@...com>, <linux-omap@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-pwm@...r.kernel.org>, <sebastian.reichel@...labora.co.uk>,
        <linux-kernel@...r.kernel.org>, <t-kristo@...com>,
        <linux@...linux.org.uk>
Subject: Re: [PATCH 2/2] clocksource: timer-dm: Check prescaler value



On Monday 18 December 2017 05:01 PM, Ladislav Michl wrote:
> Invalid prescaler value is silently ignored. Fix that
> by returning -EINVAL in such case. As invalid value
> disabled use of the prescaler, use -1 explicitely for
> that purpose.

Thanks. I will post this as part of my migration series.

> 
> Signed-off-by: Ladislav Michl <ladis@...ux-mips.org>
> ---
>  drivers/clocksource/timer-dm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/clocksource/timer-dm.c b/drivers/clocksource/timer-dm.c
> index ec3a28c90c70..95cd98be8541 100644
> --- a/drivers/clocksource/timer-dm.c
> +++ b/drivers/clocksource/timer-dm.c
> @@ -609,6 +609,9 @@ static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer,
>  	if (prescaler >= 0x00 && prescaler <= 0x07) {
>  		l |= OMAP_TIMER_CTRL_PRE;
>  		l |= prescaler << 2;
> +	} else {
> +		if (prescaler != -1)
> +			return -EINVAL;
>  	}
>  	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
>  
>