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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2010-03-05 13:44:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:47 -0800
commit4c014e872e02baa5b0bde38b2b2867ccf1f9df76 (patch)
treeb9e6315145e8c50b684ce532696a2082c90a987a /drivers/rtc
parent86c3400810a7a33e176bf33b6b074d881e829374 (diff)
rtc/mc13783: protect rtc {,un}registration by mc13783 lock
This is to protect from interrupt handlers using an unregistered rtc device. To assert that the reset irq is considered now before the rtc is registered the corresponding status is checked before. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Paul Gortmaker <p_gortmaker@yahoo.com> Cc: Valentin Longchamp <valentin.longchamp@epfl.ch> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Luotao Fu <l.fu@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-mc13783.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
index 0a978a0e40f..6a36201178a 100644
--- a/drivers/rtc/rtc-mc13783.c
+++ b/drivers/rtc/rtc-mc13783.c
@@ -169,6 +169,7 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
{
int ret;
struct mc13783_rtc *priv;
+ int rtcrst_pending;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -177,8 +178,6 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, priv);
- priv->valid = 1;
-
mc13783_lock(priv->mc13783);
ret = mc13783_irq_request(priv->mc13783, MC13783_IRQ_RTCRST,
@@ -186,33 +185,37 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
if (ret)
goto err_reset_irq_request;
+ ret = mc13783_irq_status(priv->mc13783, MC13783_IRQ_RTCRST,
+ NULL, &rtcrst_pending);
+ if (ret)
+ goto err_reset_irq_status;
+
+ priv->valid = !rtcrst_pending;
+
ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_1HZ,
mc13783_rtc_update_handler, DRIVER_NAME, priv);
if (ret)
goto err_update_irq_request;
- mc13783_unlock(priv->mc13783);
-
priv->rtc = rtc_device_register(pdev->name,
&pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
-
if (IS_ERR(priv->rtc)) {
ret = PTR_ERR(priv->rtc);
- mc13783_lock(priv->mc13783);
-
mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
err_update_irq_request:
+err_reset_irq_status:
+
mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
err_reset_irq_request:
- mc13783_unlock(priv->mc13783);
-
platform_set_drvdata(pdev, NULL);
kfree(priv);
}
+ mc13783_unlock(priv->mc13783);
+
return ret;
}
@@ -220,10 +223,10 @@ static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
{
struct mc13783_rtc *priv = platform_get_drvdata(pdev);
- rtc_device_unregister(priv->rtc);
-
mc13783_lock(priv->mc13783);
+ rtc_device_unregister(priv->rtc);
+
mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);