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rtc: at91rm9200: remove race condition

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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>
This commit is contained in:
Alexandre Belloni 2017-07-06 11:42:01 +02:00
parent 3068a254d5
commit 735ae2056b
1 changed files with 8 additions and 6 deletions
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14
drivers/rtc/rtc-at91rm9200.c
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@ -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.