rtc-at32ap700x: fix irq init oops

Reorder at32_rtc_probe() so that it's safe (no oopsing) to fire the
IRQ handler the instant that it's registered.  (Bug noted via "Debug
shared IRQ handlers" kernel debug option.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: <hcegtvedt@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-at32ap700x.c b/drivers/rtc/rtc-at32ap700x.c
index 2999214..d3b9b14 100644 (file)
--- a/drivers/rtc/rtc-at32ap700x.c
+++ b/drivers/rtc/rtc-at32ap700x.c
@@ -225,18 +225,12 @@ static int __init at32_rtc_probe(struct platform_device *pdev)
                goto out;
        }
 
-       ret = request_irq(irq, at32_rtc_interrupt, IRQF_SHARED, "rtc", rtc);
-       if (ret) {
-               dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
-               goto out;
-       }
-
        rtc->irq = irq;
        rtc->regs = ioremap(regs->start, regs->end - regs->start + 1);
        if (!rtc->regs) {
                ret = -ENOMEM;
                dev_dbg(&pdev->dev, "could not map I/O memory\n");
-               goto out_free_irq;
+               goto out;
        }
        spin_lock_init(&rtc->lock);
 
@@ -253,12 +247,18 @@ static int __init at32_rtc_probe(struct platform_device *pdev)
                                | RTC_BIT(CTRL_EN));
        }
 
+       ret = request_irq(irq, at32_rtc_interrupt, IRQF_SHARED, "rtc", rtc);
+       if (ret) {
+               dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
+               goto out_iounmap;
+       }
+
        rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
                                &at32_rtc_ops, THIS_MODULE);
        if (IS_ERR(rtc->rtc)) {
                dev_dbg(&pdev->dev, "could not register rtc device\n");
                ret = PTR_ERR(rtc->rtc);
-               goto out_iounmap;
+               goto out_free_irq;
        }
 
        platform_set_drvdata(pdev, rtc);
@@ -268,10 +268,10 @@ static int __init at32_rtc_probe(struct platform_device *pdev)
 
        return 0;
 
-out_iounmap:
-       iounmap(rtc->regs);
 out_free_irq:
        free_irq(irq, rtc);
+out_iounmap:
+       iounmap(rtc->regs);
 out:
        kfree(rtc);
        return ret;