[PATCH v3 2/4] rtc: Adjust failure return code for cmos_set_alarm()

[Mario Limonciello]

When mc146818_avoid_UIP() fails to return a valid value, this is because
UIP didn't clear in the timeout period. Adjust the return code in this
case to -ETIMEDOUT.

Tested-by: Mateusz Jończyk <mat.jonczyk@xxxxx>
Reviewed-by: Mateusz Jończyk <mat.jonczyk@xxxxx>
Acked-by: Mateusz Jończyk <mat.jonczyk@xxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: cdedc45c579f ("rtc: cmos: avoid UIP when reading alarm time")
Fixes: cd17420ebea5 ("rtc: cmos: avoid UIP when writing alarm time")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
v1->v2:
 * cover cmos_read_alarm() too
 * Add stable tags
---
 drivers/rtc/rtc-cmos.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 228fb2d11c70..391f91d3d144 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -292,7 +292,7 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 	/* This not only a rtc_op, but also called directly */
 	if (!is_valid_irq(cmos->irq))
-		return -EIO;
+		return -ETIMEDOUT;
 
 	/* Basic alarms only support hour, minute, and seconds fields.
 	 * Some also support day and month, for alarms up to a year in
@@ -557,7 +557,7 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	 * Use mc146818_avoid_UIP() to avoid this.
 	 */
 	if (!mc146818_avoid_UIP(cmos_set_alarm_callback, &p))
-		return -EIO;
+		return -ETIMEDOUT;
 
 	cmos->alarm_expires = rtc_tm_to_time64(&t->time);
 
-- 
2.34.1