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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2009-06-18 16:49:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-19 16:46:05 -0700
commite6229bec25be4ba00f31dd26e25721cc96c22262 (patch)
treea27e4c51dd8b9aaeb589a147a22bbd06bde77cf0
parent575c5807f6842422e9fe2432fd48dfcc1d7aef41 (diff)
downloadlinux-e6229bec25be4ba00f31dd26e25721cc96c22262.tar.gz
rtc: make rtc_update_irq callable with irqs enabled
The rtc_update_irq() might be called with irqs enabled, if a interrupt handler was registered without IRQF_DISABLED. Use spin_lock_irqsave/spin_unlock_irqrestore instead of spin_lock/spin_unlock. Also update kerneldoc and drivers which do extra work to follow the current interface spec, as suggestted by David Brownell. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/rtc/interface.c12
-rw-r--r--drivers/rtc/rtc-dev.c6
-rw-r--r--drivers/rtc/rtc-ds1305.c3
-rw-r--r--drivers/rtc/rtc-ds1307.c5
-rw-r--r--drivers/rtc/rtc-ds1374.c5
-rw-r--r--drivers/rtc/rtc-test.c2
6 files changed, 9 insertions, 24 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 4348c4b0d45..4cdb31a362c 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -371,19 +371,21 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable);
* @rtc: the rtc 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
+ * Context: any
*/
void rtc_update_irq(struct rtc_device *rtc,
unsigned long num, unsigned long events)
{
- spin_lock(&rtc->irq_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&rtc->irq_lock, flags);
rtc->irq_data = (rtc->irq_data + (num << 8)) | events;
- spin_unlock(&rtc->irq_lock);
+ spin_unlock_irqrestore(&rtc->irq_lock, flags);
- spin_lock(&rtc->irq_task_lock);
+ spin_lock_irqsave(&rtc->irq_task_lock, flags);
if (rtc->irq_task)
rtc->irq_task->func(rtc->irq_task->private_data);
- spin_unlock(&rtc->irq_task_lock);
+ spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
wake_up_interruptible(&rtc->irq_queue);
kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 45152f4952d..8a11de9552c 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -60,8 +60,7 @@ static void rtc_uie_task(struct work_struct *work)
err = rtc_read_time(rtc, &tm);
- local_irq_disable();
- spin_lock(&rtc->irq_lock);
+ spin_lock_irq(&rtc->irq_lock);
if (rtc->stop_uie_polling || err) {
rtc->uie_task_active = 0;
} else if (rtc->oldsecs != tm.tm_sec) {
@@ -74,10 +73,9 @@ static void rtc_uie_task(struct work_struct *work)
} else if (schedule_work(&rtc->uie_task) == 0) {
rtc->uie_task_active = 0;
}
- spin_unlock(&rtc->irq_lock);
+ spin_unlock_irq(&rtc->irq_lock);
if (num)
rtc_update_irq(rtc, num, RTC_UF | RTC_IRQF);
- local_irq_enable();
}
static void rtc_uie_timer(unsigned long data)
{
diff --git a/drivers/rtc/rtc-ds1305.c b/drivers/rtc/rtc-ds1305.c
index fc372df6534..8f410e59d9f 100644
--- a/drivers/rtc/rtc-ds1305.c
+++ b/drivers/rtc/rtc-ds1305.c
@@ -499,10 +499,7 @@ static void ds1305_work(struct work_struct *work)
if (!test_bit(FLAG_EXITING, &ds1305->flags))
enable_irq(spi->irq);
- /* rtc_update_irq() requires an IRQ-disabled context */
- local_irq_disable();
rtc_update_irq(ds1305->rtc, 1, RTC_AF | RTC_IRQF);
- local_irq_enable();
}
/*
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 8a6f9a9f9cb..47a93c022d9 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -267,12 +267,7 @@ static void ds1307_work(struct work_struct *work)
control &= ~DS1337_BIT_A1IE;
i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
- /* rtc_update_irq() assumes that it is called
- * from IRQ-disabled context.
- */
- local_irq_disable();
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
- local_irq_enable();
}
out:
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 4d32e328f6c..32b27739ec2 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -296,12 +296,7 @@ static void ds1374_work(struct work_struct *work)
control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
- /* rtc_update_irq() assumes that it is called
- * from IRQ-disabled context.
- */
- local_irq_disable();
rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
- local_irq_enable();
}
out:
diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c
index e478280ff62..51725f7755b 100644
--- a/drivers/rtc/rtc-test.c
+++ b/drivers/rtc/rtc-test.c
@@ -93,7 +93,6 @@ 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, 1, RTC_PF | RTC_IRQF);
else if (strncmp(buf, "alarm", 5) == 0)
@@ -102,7 +101,6 @@ static ssize_t test_irq_store(struct device *dev,
rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
else
retval = -EINVAL;
- local_irq_enable();
return retval;
}