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[1/4] rtc: ep93xx: Fix 'rtc' may be used uninitialized warning

Message ID 1313017318-789-2-git-send-email-john.stultz@linaro.org
State Accepted
Commit bf6ed027bcc93f8d54d321fe87f0434b25699eb1
Headers show

Commit Message

John Stultz Aug. 10, 2011, 11:01 p.m. UTC 
From: Axel Lin <axel.lin@gmail.com>

commit 92d921c5d "rtc: ep93xx: Initialize drvdata before registering device"
ensures the drvdata is initialized prior to registering the rtc device.
But it set the drvdata to an uninitialized pointer.
Thus calling platform_get_drvdata in ep93xx_rtc_remove does not get correct address.

This patch fixes below warning by adding struct rtc_device *rtc to struct ep93xx_rtc.
Then set platform drvdata to ep93xx_rtc instead of rtc.

  CC      drivers/rtc/rtc-ep93xx.o
drivers/rtc/rtc-ep93xx.c: In function 'ep93xx_rtc_probe':
drivers/rtc/rtc-ep93xx.c:154: warning: 'rtc' may be used uninitialized in this function

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/rtc/rtc-ep93xx.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)
diff mbox

Patch

diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
index 335551d..14a42a1 100644
--- a/drivers/rtc/rtc-ep93xx.c
+++ b/drivers/rtc/rtc-ep93xx.c
@@ -36,6 +36,7 @@ 
  */
 struct ep93xx_rtc {
 	void __iomem	*mmio_base;
+	struct rtc_device *rtc;
 };
 
 static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
@@ -130,7 +131,6 @@  static int __init ep93xx_rtc_probe(struct platform_device *pdev)
 {
 	struct ep93xx_rtc *ep93xx_rtc;
 	struct resource *res;
-	struct rtc_device *rtc;
 	int err;
 
 	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
@@ -151,12 +151,12 @@  static int __init ep93xx_rtc_probe(struct platform_device *pdev)
 		return -ENXIO;
 
 	pdev->dev.platform_data = ep93xx_rtc;
-	platform_set_drvdata(pdev, rtc);
+	platform_set_drvdata(pdev, ep93xx_rtc);
 
-	rtc = rtc_device_register(pdev->name,
+	ep93xx_rtc->rtc = rtc_device_register(pdev->name,
 				&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc)) {
-		err = PTR_ERR(rtc);
+	if (IS_ERR(ep93xx_rtc->rtc)) {
+		err = PTR_ERR(ep93xx_rtc->rtc);
 		goto exit;
 	}
 
@@ -167,7 +167,7 @@  static int __init ep93xx_rtc_probe(struct platform_device *pdev)
 	return 0;
 
 fail:
-	rtc_device_unregister(rtc);
+	rtc_device_unregister(ep93xx_rtc->rtc);
 exit:
 	platform_set_drvdata(pdev, NULL);
 	pdev->dev.platform_data = NULL;
@@ -176,11 +176,11 @@  exit:
 
 static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
 {
-	struct rtc_device *rtc = platform_get_drvdata(pdev);
+	struct ep93xx_rtc *ep93xx_rtc = platform_get_drvdata(pdev);
 
 	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
 	platform_set_drvdata(pdev, NULL);
-	rtc_device_unregister(rtc);
+	rtc_device_unregister(ep93xx_rtc->rtc);
 	pdev->dev.platform_data = NULL;
 
 	return 0;