rtc: ep93xx: Fix 'rtc' may be used uninitialized warning
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
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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 @@
{
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 @@
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 @@
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 @@
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;