rtc: pm8xxx: Replace spin_lock_irqsave with spin_lock in hard IRQ

It is redundant to do irqsave and irqrestore in hardIRQ context, where
it has been in a irq-disabled context.
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1612355981-6764-3-git-send-email-tanxiaofei@huawei.com

drivers/rtc/rtc-pm8xxx.c

@@ -352,16 +352,15 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
 	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
 	unsigned int ctrl_reg;
 	int rc;
-	unsigned long irq_flags;
 
 	rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
 
-	spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
+	spin_lock(&rtc_dd->ctrl_reg_lock);
 
 	/* Clear the alarm enable bit */
 	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
 	if (rc) {
-		spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+		spin_unlock(&rtc_dd->ctrl_reg_lock);
 		goto rtc_alarm_handled;
 	}
 
@@ -369,13 +368,13 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
 
 	rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
 	if (rc) {
-		spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+		spin_unlock(&rtc_dd->ctrl_reg_lock);
 		dev_err(rtc_dd->rtc_dev,
 			"Write to alarm control register failed\n");
 		goto rtc_alarm_handled;
 	}
 
-	spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+	spin_unlock(&rtc_dd->ctrl_reg_lock);
 
 	/* Clear RTC alarm register */
 	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl2, &ctrl_reg);