From 2601a46474db2dcbc08ee690e56f08a10abe65cb Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sat, 25 Nov 2006 11:09:27 -0800 Subject: [PATCH] rtc framework handles periodic irqs The RTC framework has an irq_set_freq() method that should be used to manage the periodic IRQ frequency, but the current ioctl logic doesn't know how to do that. This patch teaches it how. This means that drivers implementing irq_set_freq() will automatically support RTC_IRQP_{READ,SET} ioctls; that logic doesn't need duplication within the driver. [akpm@osdl.org: export rtc_irq_set_freq] Signed-off-by: David Brownell Acked-by: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/interface.c | 1 + drivers/rtc/rtc-dev.c | 13 ++++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 579cd667b16f..4783ec68fb3c 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -265,3 +265,4 @@ int rtc_irq_set_freq(struct class_device *class_dev, struct rtc_task *task, int } return err; } +EXPORT_SYMBOL_GPL(rtc_irq_set_freq); diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 583789c66cdb..3109865e8d73 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -214,7 +214,7 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file, struct rtc_wkalrm alarm; void __user *uarg = (void __user *) arg; - /* check that the calles has appropriate permissions + /* check that the calling task has appropriate permissions * for certain ioctls. doing this check here is useful * to avoid duplicate code in each driver. */ @@ -299,6 +299,17 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file, err = rtc_set_time(class_dev, &tm); break; + + case RTC_IRQP_READ: + if (ops->irq_set_freq) + err = put_user(rtc->irq_freq, (unsigned long *) arg); + break; + + case RTC_IRQP_SET: + if (ops->irq_set_freq) + err = rtc_irq_set_freq(class_dev, rtc->irq_task, arg); + break; + #if 0 case RTC_EPOCH_SET: #ifndef rtc_epoch -- cgit v1.2.3-58-ga151 From d728b1e69fd5829ec2ab2434381e5a268d4f684a Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sat, 25 Nov 2006 11:09:28 -0800 Subject: [PATCH] rtc class locking bugfixes I got a lockdep warning when running "rtctest" so I though it'd be good to see what was up. - The warning was for rtc->irq_task_lock, gotten from rtc_update_irq() by irq handlerss ... but in a handful of other cases, grabbed without blocking IRQs. - Some callers to rtc_update_irq() were not ensuring IRQs were blocked, yet the routine expects that; make sure all callers block IRQs. It would appear that RTC API tests haven't been part of anyone's kernel regression test suite recently, at least not with lockdep running. Signed-off-by: David Brownell Acked-by: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/interface.c | 15 +++++++++++---- drivers/rtc/rtc-at91.c | 3 ++- drivers/rtc/rtc-dev.c | 12 +++++++----- drivers/rtc/rtc-ds1553.c | 3 ++- drivers/rtc/rtc-test.c | 2 ++ 5 files changed, 24 insertions(+), 11 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 4783ec68fb3c..6f11f6dfdd9d 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -145,6 +145,13 @@ int rtc_set_alarm(struct class_device *class_dev, struct rtc_wkalrm *alarm) } EXPORT_SYMBOL_GPL(rtc_set_alarm); +/** + * rtc_update_irq - report RTC periodic, alarm, and/or update irqs + * @class_dev: the rtc's class device + * @num: how many irqs are being reported (usually one) + * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF + * Context: in_interrupt(), irqs blocked + */ void rtc_update_irq(struct class_device *class_dev, unsigned long num, unsigned long events) { @@ -201,12 +208,12 @@ int rtc_irq_register(struct class_device *class_dev, struct rtc_task *task) if (task == NULL || task->func == NULL) return -EINVAL; - spin_lock(&rtc->irq_task_lock); + spin_lock_irq(&rtc->irq_task_lock); if (rtc->irq_task == NULL) { rtc->irq_task = task; retval = 0; } - spin_unlock(&rtc->irq_task_lock); + spin_unlock_irq(&rtc->irq_task_lock); return retval; } @@ -216,10 +223,10 @@ void rtc_irq_unregister(struct class_device *class_dev, struct rtc_task *task) { struct rtc_device *rtc = to_rtc_device(class_dev); - spin_lock(&rtc->irq_task_lock); + spin_lock_irq(&rtc->irq_task_lock); if (rtc->irq_task == task) rtc->irq_task = NULL; - spin_unlock(&rtc->irq_task_lock); + spin_unlock_irq(&rtc->irq_task_lock); } EXPORT_SYMBOL_GPL(rtc_irq_unregister); diff --git a/drivers/rtc/rtc-at91.c b/drivers/rtc/rtc-at91.c index bd61e99540a3..5c8addcaf1fb 100644 --- a/drivers/rtc/rtc-at91.c +++ b/drivers/rtc/rtc-at91.c @@ -292,7 +292,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev) AT91_RTC_CALEV); ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt, - IRQF_SHARED, "at91_rtc", pdev); + IRQF_DISABLED | IRQF_SHARED, + "at91_rtc", pdev); if (ret) { printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", AT91_ID_SYS); diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 3109865e8d73..814b9e1873f5 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -61,7 +61,9 @@ static void rtc_uie_task(void *data) int err; err = rtc_read_time(&rtc->class_dev, &tm); - spin_lock_irq(&rtc->irq_lock); + + local_irq_disable(); + spin_lock(&rtc->irq_lock); if (rtc->stop_uie_polling || err) { rtc->uie_task_active = 0; } else if (rtc->oldsecs != tm.tm_sec) { @@ -74,11 +76,11 @@ static void rtc_uie_task(void *data) } else if (schedule_work(&rtc->uie_task) == 0) { rtc->uie_task_active = 0; } - spin_unlock_irq(&rtc->irq_lock); + spin_unlock(&rtc->irq_lock); if (num) rtc_update_irq(&rtc->class_dev, num, RTC_UF | RTC_IRQF); + local_irq_enable(); } - static void rtc_uie_timer(unsigned long data) { struct rtc_device *rtc = (struct rtc_device *)data; @@ -238,10 +240,10 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file, /* avoid conflicting IRQ users */ if (cmd == RTC_PIE_ON || cmd == RTC_PIE_OFF || cmd == RTC_IRQP_SET) { - spin_lock(&rtc->irq_task_lock); + spin_lock_irq(&rtc->irq_task_lock); if (rtc->irq_task) err = -EBUSY; - spin_unlock(&rtc->irq_task_lock); + spin_unlock_irq(&rtc->irq_task_lock); if (err < 0) return err; diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c index 78552e6e76aa..001eb1123a65 100644 --- a/drivers/rtc/rtc-ds1553.c +++ b/drivers/rtc/rtc-ds1553.c @@ -340,7 +340,8 @@ static int __init ds1553_rtc_probe(struct platform_device *pdev) if (pdata->irq >= 0) { writeb(0, ioaddr + RTC_INTERRUPTS); - if (request_irq(pdata->irq, ds1553_rtc_interrupt, IRQF_SHARED, + if (request_irq(pdata->irq, ds1553_rtc_interrupt, + IRQF_DISABLED | IRQF_SHARED, pdev->name, pdev) < 0) { dev_warn(&pdev->dev, "interrupt not available.\n"); pdata->irq = -1; diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c index bc4bd24508a2..6ef9c62d5032 100644 --- a/drivers/rtc/rtc-test.c +++ b/drivers/rtc/rtc-test.c @@ -99,6 +99,7 @@ static ssize_t test_irq_store(struct device *dev, struct rtc_device *rtc = platform_get_drvdata(plat_dev); retval = count; + local_irq_disable(); if (strncmp(buf, "tick", 4) == 0) rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF); else if (strncmp(buf, "alarm", 5) == 0) @@ -107,6 +108,7 @@ static ssize_t test_irq_store(struct device *dev, rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF); else retval = -EINVAL; + local_irq_enable(); return retval; } -- cgit v1.2.3-58-ga151 From 17ad78e59a0334d64c3a37f964b15ab9918313c7 Mon Sep 17 00:00:00 2001 From: Adrian Bunk Date: Sat, 25 Nov 2006 11:09:29 -0800 Subject: [PATCH] drivers/rtc/rtc-rs5c372.c: fix a NULL dereference The correct order is: NULL check before dereference This was a guaranteed NULL dereference with debugging enabled since rs5c372_sysfs_show_osc() does actually pass NULL... Spotted by the Coverity checker. Signed-off-by: Adrian Bunk Acked-by: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-rs5c372.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c index 2a86632580f1..a44fe4efa216 100644 --- a/drivers/rtc/rtc-rs5c372.c +++ b/drivers/rtc/rtc-rs5c372.c @@ -126,13 +126,13 @@ static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) return -EIO; } - dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, *trim); - if (osc) *osc = (buf & RS5C372_TRIM_XSL) ? 32000 : 32768; - if (trim) + if (trim) { *trim = buf & RS5C372_TRIM_MASK; + dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, *trim); + } return 0; } -- cgit v1.2.3-58-ga151