提交 5ab9a52a 编写于 作者: A Alexander Shiyan 提交者: Linus Torvalds

drivers/rtc/rtc-mc13xxx.c: fix potential race condition

RTC drivers must not return an error after device registration.  This
patch makes RTC registration as the last action.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Acked-by: NAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 fda9909d
......@@ -247,8 +247,6 @@ static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
struct mc13xxx_rtc *priv = dev;
struct mc13xxx *mc13xxx = priv->mc13xxx;
dev_dbg(&priv->rtc->dev, "Alarm\n");
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
mc13xxx_irq_ack(mc13xxx, irq);
......@@ -261,8 +259,6 @@ static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
struct mc13xxx_rtc *priv = dev;
struct mc13xxx *mc13xxx = priv->mc13xxx;
dev_dbg(&priv->rtc->dev, "1HZ\n");
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
mc13xxx_irq_ack(mc13xxx, irq);
......@@ -283,7 +279,6 @@ static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
struct mc13xxx_rtc *priv = dev;
struct mc13xxx *mc13xxx = priv->mc13xxx;
dev_warn(&priv->rtc->dev, "Contents of the RTC are no longer valid\n");
priv->valid = 0;
mc13xxx_irq_mask(mc13xxx, irq);
......@@ -307,11 +302,6 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, priv);
priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&mc13xxx_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc))
return PTR_ERR(priv->rtc);
mc13xxx_lock(mc13xxx);
mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST);
......@@ -319,24 +309,30 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
if (ret)
goto err_reset_irq_request;
goto err_irq_request;
ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ,
mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
if (ret)
goto err_reset_irq_status;
goto err_irq_request;
ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
if (!ret)
goto err_reset_irq_request;
if (ret)
goto err_irq_request;
mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
mc13xxx_unlock(mc13xxx);
priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&mc13xxx_rtc_ops, THIS_MODULE);
err_reset_irq_status:
return 0;
err_irq_request:
mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
err_reset_irq_request:
mc13xxx_unlock(mc13xxx);
return ret;
......
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