The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/rtc/rtc-mxc_v2.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/rtc/rtc-mxc_v2.c b/drivers/rtc/rtc-mxc_v2.c
index 9e14efb990b2..4cc121a41fe0 100644
--- a/drivers/rtc/rtc-mxc_v2.c
+++ b/drivers/rtc/rtc-mxc_v2.c
@@ -343,6 +343,12 @@ static int mxc_rtc_probe(struct platform_device *pdev)
return ret;
}
+ pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(pdata->rtc))
+ return PTR_ERR(pdata->rtc);
+
+ pdata->rtc->ops = &mxc_rtc_ops;
+
clk_disable(pdata->clk);
platform_set_drvdata(pdev, pdata);
ret =
@@ -354,15 +360,11 @@ static int mxc_rtc_probe(struct platform_device *pdev)
return ret;
}
- pdata->rtc =
- devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops,
- THIS_MODULE);
- if (IS_ERR(pdata->rtc)) {
+ ret = rtc_register_device(pdata->rtc);
+ if (ret < 0)
clk_unprepare(pdata->clk);
- return PTR_ERR(pdata->rtc);
- }
- return 0;
+ return ret;
}
static int mxc_rtc_remove(struct platform_device *pdev)
--
2.17.0
