Messages in this thread Patch in this message | | | Date | Wed, 17 Jan 2018 22:47:14 +0100 | From | Ladislav Michl <> | Subject | [PATCH 1/3] clocksource: timer-dm: Check prescaler value |
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Invalid value silently disables use of the prescaler. Use -1 explicitely for that purpose and error out on invalid value.
Signed-off-by: Ladislav Michl <ladis@linux-mips.org> --- drivers/clocksource/timer-dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/timer-dm.c b/drivers/clocksource/timer-dm.c index 60db1734ea3b..324ec93d3dd2 100644 --- a/drivers/clocksource/timer-dm.c +++ b/drivers/clocksource/timer-dm.c @@ -663,13 +663,13 @@ int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) { u32 l; - if (unlikely(!timer)) + if (unlikely(!timer) || prescaler < -1 || prescaler > 7) return -EINVAL; omap_dm_timer_enable(timer); l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2)); - if (prescaler >= 0x00 && prescaler <= 0x07) { + if (prescaler >= 0) { l |= OMAP_TIMER_CTRL_PRE; l |= prescaler << 2; }
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