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rtc: mxc: use spin_lock_irqsave instead of spin_lock_irq in IRQ context 

As spin_unlock_irq will enable interrupts.
mxc_rtc_irq_enable is called from interrupt handler mxc_rtc_interrupt.
Interrupts are enabled in interrupt handler.
Use spin_lock_irqsave/spin_unlock_irqrestore instead of spin_(un)lock_irq
in IRQ context to avoid this.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Link: https://lore.kernel.org/r/20190807082310.10135-1-huangfq.daxian@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Fuqian Huang 2019-08-07 16:23:10 +08:00 committed by Alexandre Belloni
parent 41a8e19f47
commit b0a3fa4465
1 changed files with 3 additions and 2 deletions
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5
drivers/rtc/rtc-mxc.c
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@ -184,8 +184,9 @@ static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
void __iomem *ioaddr = pdata->ioaddr;
u32 reg;
unsigned long flags;
spin_lock_irq(&pdata->rtc->irq_lock);
spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
reg = readw(ioaddr + RTC_RTCIENR);
if (enabled)
@ -194,7 +195,7 @@ static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
reg &= ~bit;
writew(reg, ioaddr + RTC_RTCIENR);
spin_unlock_irq(&pdata->rtc->irq_lock);
spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
}
/* This function is the RTC interrupt service routine. */