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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-07-06 11:42:01 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-07-07 13:14:12 +0200
commit735ae2056b3c7296bb188d079c020f606a679c4a (patch)
treee1662976fdd97074f037b6131c78c503a84008d1 /drivers/rtc
parent3068a254d5519cd5116f61297462da6d1aa84c20 (diff)
downloadlinux-735ae2056b3c7296bb188d079c020f606a679c4a.tar.bz2
rtc: at91rm9200: remove race condition
While highly unlikely, it is possible to get an interrupt as soon as it is requested. In that case, at91_rtc_interrupt() will be called with rtc == NULL. Solve that by using devm_rtc_allocate_device/rtc_register_device. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-at91rm9200.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index b60fd477778f..e221b78b6f10 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -409,6 +409,11 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+ platform_set_drvdata(pdev, rtc);
+
sclk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sclk))
return PTR_ERR(sclk);
@@ -441,13 +446,10 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
if (!device_can_wakeup(&pdev->dev))
device_init_wakeup(&pdev->dev, 1);
- rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
- &at91_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc)) {
- ret = PTR_ERR(rtc);
+ rtc->ops = &at91_rtc_ops;
+ ret = rtc_register_device(rtc);
+ if (ret)
goto err_clk;
- }
- platform_set_drvdata(pdev, rtc);
/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
* completion.