lkml.org 
[lkml]   [2018]   [Jan]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v6 10/10] clocksource: timer-dm: Check prescaler value
On Tue, Jan 02, 2018 at 03:39:59PM +0530, Keerthy wrote:
> From: Ladislav Michl <ladis@linux-mips.org>
>
> 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.
>
> Signed-off-by: Ladislav Michl <ladis@linux-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 60db173..01a9cb0 100644
> --- a/drivers/clocksource/timer-dm.c
> +++ b/drivers/clocksource/timer-dm.c
> @@ -672,6 +672,9 @@ int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
> if (prescaler >= 0x00 && prescaler <= 0x07) {
> l |= OMAP_TIMER_CTRL_PRE;
> l |= prescaler << 2;
> + } else {
> + if (prescaler != -1)
> + return -EINVAL;

Argh... This is actually wrong, as it leaves timer enabled.
I suggest simply dropping this patch and I'll rethink whole
approach a bit later (and better).

> }
> omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
>

Sorry for the noise,
ladis

\
 
 \ /
  Last update: 2018-01-04 23:47    [W:0.092 / U:1.020 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site