rtc: cmos: prevent kernel warning on IRQ flags mismatch

The Microsoft Surface 3 tablet shares interrupt line between RTC and one of SPI
controllers. However, the rtc_cmos driver doesn't allow shared interrupts and
user sees the following warning

genirq: Flags mismatch irq 8. 00000080 (8086228E:02) vs. 00000000 (rtc0)
...
[<ffffffffa004eb01>] pxa2xx_spi_probe+0x151/0x600 [spi_pxa2xx_platform]

Allow RTC driver to use shared interrupts.

Seems we are on the safe side to do just this simple change since
cmos_interrupt() handler checks for the actual hardware status anyway.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 8f7034b..84fb541 100644 (file)
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -725,7 +725,7 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
                        rtc_cmos_int_handler = cmos_interrupt;
 
                retval = request_irq(rtc_irq, rtc_cmos_int_handler,
-                               0, dev_name(&cmos_rtc.rtc->dev),
+                               IRQF_SHARED, dev_name(&cmos_rtc.rtc->dev),
                                cmos_rtc.rtc);
                if (retval < 0) {
                        dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);