linux-kernel - [PATCH] clocksource: imx-tpm: correct -ETIME return condition check

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Date:   Thu, 19 Apr 2018 14:04:43 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] clocksource: imx-tpm: correct -ETIME return condition check

The additional brakets added to tpm_set_next_event's return
value computation causes (int) forced type conversion NOT
taking effect, and the incorrect value return will cause
various system timer issue, like RCU stall etc..

This patch removes the additional brakets to make sure
tpm_set_next_event always returns correct value.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
	resend, since I got failure message of sending mail to linux-kernel@...r.kernel.org.
 drivers/clocksource/timer-imx-tpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 05d97a6..6c83184 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -114,7 +114,7 @@ static int tpm_set_next_event(unsigned long delta,
 	 * of writing CNT registers which may cause the min_delta event got
 	 * missed, so we need add a ETIME check here in case it happened.
 	 */
-	return (int)((next - now) <= 0) ? -ETIME : 0;
+	return (int)(next - now) <= 0 ? -ETIME : 0;
 }
 
 static int tpm_set_state_oneshot(struct clock_event_device *evt)
-- 
2.7.4