linux-kernel - [PATCH 2/3] rtc: mxc: fix crash on boot

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Message-Id: <1304523088-17039-3-git-send-email-w.sang@pengutronix.de>
Date:	Wed,  4 May 2011 17:31:27 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	rtc-linux@...glegroups.com
Cc:	linux-kernel@...r.kernel.org, johnstul@...ibm.com,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: [PATCH 2/3] rtc: mxc: fix crash on boot

Commit f44f7f96a20 ("RTC: Initialize kernel state from RTC") caused a
crash using the mxc-rtc driver.

The reason is that rtc_device_register() calls rtc_read_alarm() after
that change, when the driver does not have all driver data set up yet.

Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
---
 drivers/rtc/rtc-mxc.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 826ab64..d814417 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -418,14 +418,6 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
 		goto exit_put_clk;
 	}
 
-	rtc = rtc_device_register(pdev->name, &pdev->dev, &mxc_rtc_ops,
-				  THIS_MODULE);
-	if (IS_ERR(rtc)) {
-		ret = PTR_ERR(rtc);
-		goto exit_put_clk;
-	}
-
-	pdata->rtc = rtc;
 	platform_set_drvdata(pdev, pdata);
 
 	/* Configure and enable the RTC */
@@ -438,8 +430,19 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
 		pdata->irq = -1;
 	}
 
+	rtc = rtc_device_register(pdev->name, &pdev->dev, &mxc_rtc_ops,
+				  THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		ret = PTR_ERR(rtc);
+		goto exit_clr_drvdata;
+	}
+
+	pdata->rtc = rtc;
+
 	return 0;
 
+exit_clr_drvdata:
+	platform_set_drvdata(pdev, NULL);
 exit_put_clk:
 	clk_disable(pdata->clk);
 	clk_put(pdata->clk);
-- 
1.7.2.5

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