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bfin: delay IRQ registration until driver is ready

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Make sure we do not actually request the RTC IRQ until the device driver
is fully ready to handle and process any interrupt.  This way a spurious
interrupt won't crash the system (which may happen if the bootloader was
poking the RTC right before booting Linux).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2009-06-30 11:41:43 -07:00 committed by Linus Torvalds
parent ee905d0c58
commit 9980060bad
1 changed files with 15 additions and 15 deletions
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30
drivers/rtc/rtc-bfin.c
View file

@ -1,8 +1,8 @@
/*
* Blackfin On-Chip Real Time Clock Driver
* Supports BF52[257]/BF53[123]/BF53[467]/BF54[24789]
* Supports BF51x/BF52x/BF53[123]/BF53[467]/BF54x
*
* Copyright 2004-2008 Analog Devices Inc.
* Copyright 2004-2009 Analog Devices Inc.
*
* Enter bugs at http://blackfin.uclinux.org/
*
@ -363,7 +363,7 @@ static int __devinit bfin_rtc_probe(struct platform_device *pdev)
struct bfin_rtc *rtc;
struct device *dev = &pdev->dev;
int ret = 0;
unsigned long timeout;
unsigned long timeout = jiffies + HZ;
dev_dbg_stamp(dev);
@ -374,32 +374,32 @@ static int __devinit bfin_rtc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, rtc);
device_init_wakeup(dev, 1);
/* Register our RTC with the RTC framework */
rtc->rtc_dev = rtc_device_register(pdev->name, dev, &bfin_rtc_ops,
THIS_MODULE);
if (unlikely(IS_ERR(rtc->rtc_dev))) {
ret = PTR_ERR(rtc->rtc_dev);
goto err;
}
/* Grab the IRQ and init the hardware */
ret = request_irq(IRQ_RTC, bfin_rtc_interrupt, IRQF_SHARED, pdev->name, dev);
if (unlikely(ret))
goto err;
goto err_reg;
/* sometimes the bootloader touched things, but the write complete was not
* enabled, so let's just do a quick timeout here since the IRQ will not fire ...
*/
timeout = jiffies + HZ;
while (bfin_read_RTC_ISTAT() & RTC_ISTAT_WRITE_PENDING)
if (time_after(jiffies, timeout))
break;
bfin_rtc_reset(dev, RTC_ISTAT_WRITE_COMPLETE);
bfin_write_RTC_SWCNT(0);
/* Register our RTC with the RTC framework */
rtc->rtc_dev = rtc_device_register(pdev->name, dev, &bfin_rtc_ops, THIS_MODULE);
if (unlikely(IS_ERR(rtc->rtc_dev))) {
ret = PTR_ERR(rtc->rtc_dev);
goto err_irq;
}
return 0;
err_irq:
free_irq(IRQ_RTC, dev);
err:
err_reg:
rtc_device_unregister(rtc->rtc_dev);
err:
kfree(rtc);
return ret;
}