[PATCH 3.18 001/150] drivers/rtc/rtc-sirfsoc.c: move hardware initilization earlier in probe

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guo Zeng <guo.zeng@xxxxxxx>

commit 0e95325525c4383565cea4f402f15a3113162d05 upstream.

Move rtc register to be later than hardware initialization.  The reason
is that devm_rtc_device_register() will do read_time() which is a
callback accessing hardware.  This sometimes causes a hang in the
hardware related callback.

Signed-off-by: Guo Zeng <guo.zeng@xxxxxxx>
Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/rtc/rtc-sirfsoc.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/rtc/rtc-sirfsoc.c
+++ b/drivers/rtc/rtc-sirfsoc.c
@@ -286,14 +286,6 @@ static int sirfsoc_rtc_probe(struct plat
 	rtc_div = ((32768 / RTC_HZ) / 2) - 1;
 	sirfsoc_rtc_iobrg_writel(rtc_div, rtcdrv->rtc_base + RTC_DIV);
 
-	rtcdrv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-			&sirfsoc_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtcdrv->rtc)) {
-		err = PTR_ERR(rtcdrv->rtc);
-		dev_err(&pdev->dev, "can't register RTC device\n");
-		return err;
-	}
-
 	/* 0x3 -> RTC_CLK */
 	sirfsoc_rtc_iobrg_writel(SIRFSOC_RTC_CLK,
 			rtcdrv->rtc_base + RTC_CLOCK_SWITCH);
@@ -308,6 +300,14 @@ static int sirfsoc_rtc_probe(struct plat
 	rtcdrv->overflow_rtc =
 		sirfsoc_rtc_iobrg_readl(rtcdrv->rtc_base + RTC_SW_VALUE);
 
+	rtcdrv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+			&sirfsoc_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtcdrv->rtc)) {
+		err = PTR_ERR(rtcdrv->rtc);
+		dev_err(&pdev->dev, "can't register RTC device\n");
+		return err;
+	}
+
 	rtcdrv->irq = platform_get_irq(pdev, 0);
 	err = devm_request_irq(
 			&pdev->dev,


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