linux-kernel - [PATCH 2/3] RTC/nuc900: patch for modifying enable/disable IRQs and driver data setting location

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Date:	Thu, 24 Jun 2010 17:00:19 +0800
From:	Wan ZongShun <mcuos.com@...il.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	rtc-linux <rtc-linux@...glegroups.com>
Subject: [PATCH 2/3] RTC/nuc900:  patch for modifying enable/disable IRQs
 and driver data setting location

This patch does two modifications:

(1) Adjust enable/disable IRQs location,enable it after rtc registration
and disable it prior to unregistration.
(2) Put 'platform_set_drvdata(pdev, nuc900_rtc)' in front of rtc registration still
be safety, though there is no need to do this, when I move enable irq after
rtc registration, I think still put 'platform_set_drvdata' before rtc registration
that would be a good habit.

Signed-off-by: Wan ZongShun <mcuos.com@...il.com>

---
 drivers/rtc/rtc-nuc900.c |   23 ++++++++++++-----------
 1 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
index 84336d1..0267ea3 100644
--- a/drivers/rtc/rtc-nuc900.c
+++ b/drivers/rtc/rtc-nuc900.c
@@ -269,29 +269,30 @@ static int __devinit nuc900_rtc_probe(struct platform_device *pdev)
 		goto fail2;
 	}

-	nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
-	if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,
-				IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {
-		dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
-		err = -EBUSY;
-		goto fail3;
-	}
+	platform_set_drvdata(pdev, nuc900_rtc);

 	nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
 						&nuc900_rtc_ops, THIS_MODULE);
 	if (IS_ERR(nuc900_rtc->rtcdev)) {
 		dev_err(&pdev->dev, "rtc device register faild\n");
 		err = PTR_ERR(nuc900_rtc->rtcdev);
-		goto fail4;
+		goto fail3;
 	}

-	platform_set_drvdata(pdev, nuc900_rtc);
 	__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,
 					nuc900_rtc->rtc_reg + REG_RTC_TSSR);

+	nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
+	if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,
+				IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {
+		dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
+		err = -EBUSY;
+		goto fail4;
+	}
+
 	return 0;

-fail4:	free_irq(nuc900_rtc->irq_num, nuc900_rtc);
+fail4:	rtc_device_unregister(nuc900_rtc->rtcdev);
 fail3:	iounmap(nuc900_rtc->rtc_reg);
 fail2:	release_mem_region(res->start, resource_size(res));
 fail1:	kfree(nuc900_rtc);
@@ -303,8 +304,8 @@ static int __devexit nuc900_rtc_remove(struct platform_device *pdev)
 	struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev);
 	struct resource *res;

-	rtc_device_unregister(nuc900_rtc->rtcdev);
 	free_irq(nuc900_rtc->irq_num, nuc900_rtc);
+	rtc_device_unregister(nuc900_rtc->rtcdev);
 	iounmap(nuc900_rtc->rtc_reg);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
1.6.3.3
--
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