From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ladislav Michl Subject: [PATCH 3/6] clocksource: timer-ti-dm: Check prescaler value Date: Fri, 23 Feb 2018 11:15:01 +0100 Message-ID: <20180223101501.GD5746@lenoch> References: <20180223101254.GA5746@lenoch> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20180223101254.GA5746@lenoch> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pwm@vger.kernel.org Cc: t-kristo@ti.com, grygorii.strashko@ti.com, aaro.koskinen@iki.fi, tony@atomide.com, Keerthy , daniel.lezcano@linaro.org, robh+dt@kernel.org, narmstrong@baylibre.com, thierry.reding@gmail.com, Brecht Neyrinck , sebastian.reichel@collabora.co.uk, Thomas Gleixner , Claudiu.Beznea@microchip.com List-Id: linux-pwm@vger.kernel.org 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 --- drivers/clocksource/timer-ti-dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c index 4d645d6c6c31..b57e875b74ca 100644 --- a/drivers/clocksource/timer-ti-dm.c +++ b/drivers/clocksource/timer-ti-dm.c @@ -657,13 +657,13 @@ static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, { 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; } -- 2.16.1