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Subject[PATCH 17/17] RTC interrupt handling cleanups
Date
commit f94d41db30d6430bc6d3e53602258d3933f93103
Author: Jeff Garzik <jeff@garzik.org>
Date: Sun Oct 21 01:51:50 2007 -0400

RTC interrupt handling cleanups

arm/mach-integrator/time: arm_rtc_interrupt() never uses its arguments,
so pass NULL to make this explicit and potentially reduce future
confusion.

hpet.c and rtc.c: pass rtc_int_flag through the standard data-passing
mechanism, dev_id (2nd arg).

rtc-at32ap700x, rtc-m48t59.c: delete pointless cast from void*

rtc-bfin: calling spin_lock_irq() in interrupt handler marked
IRQF_DISABLED is unwise. Use safer spin_lock_irqsave() instead.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

arch/arm/mach-integrator/time.c | 2 +-
arch/x86/kernel/hpet.c | 4 ++--
drivers/char/rtc.c | 7 ++++---
drivers/rtc/rtc-at32ap700x.c | 2 +-
drivers/rtc/rtc-bfin.c | 5 +++--
drivers/rtc/rtc-m48t59.c | 2 +-
6 files changed, 12 insertions(+), 10 deletions(-)
f94d41db30d6430bc6d3e53602258d3933f93103
diff --git a/arch/arm/mach-integrator/time.c b/arch/arm/mach-integrator/time.c
index 5278f58..5235f64 100644
--- a/arch/arm/mach-integrator/time.c
+++ b/arch/arm/mach-integrator/time.c
@@ -125,7 +125,7 @@ static int rtc_probe(struct amba_device *dev, void *id)
xtime.tv_sec = __raw_readl(rtc_base + RTC_DR);

ret = request_irq(dev->irq[0], arm_rtc_interrupt, IRQF_DISABLED,
- "rtc-pl030", dev);
+ "rtc-pl030", NULL);
if (ret)
goto map_out;

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 53303f2..7c07653 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -621,7 +621,7 @@ static void hpet_rtc_timer_reinit(void)
}
}

-irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
+irqreturn_t hpet_rtc_interrupt(int dummy, void *dev_id)
{
struct rtc_time curr_time;
unsigned long rtc_int_flag = 0;
@@ -651,7 +651,7 @@ irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)

if (rtc_int_flag) {
rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8));
- rtc_interrupt(rtc_int_flag, dev_id);
+ rtc_interrupt(-1, (void *) rtc_int_flag);
}
return IRQ_HANDLED;
}
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index ec6b65e..533328b 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -233,7 +233,7 @@ static inline unsigned char rtc_is_updating(void)
* (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.)
*/

-irqreturn_t rtc_interrupt(int irq, void *dev_id)
+irqreturn_t rtc_interrupt(int dummy, void *dev_id)
{
/*
* Can be an alarm interrupt, update complete interrupt,
@@ -246,12 +246,13 @@ irqreturn_t rtc_interrupt(int irq, void *dev_id)
rtc_irq_data += 0x100;
rtc_irq_data &= ~0xff;
if (is_hpet_enabled()) {
+ unsigned long val = (unsigned long) dev_id;
/*
* In this case it is HPET RTC interrupt handler
* calling us, with the interrupt information
- * passed as arg1, instead of irq.
+ * passed as arg2 (dev_id)
*/
- rtc_irq_data |= (unsigned long)irq & 0xF0;
+ rtc_irq_data |= val & 0xF0;
} else {
rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0);
}
diff --git a/drivers/rtc/rtc-at32ap700x.c b/drivers/rtc/rtc-at32ap700x.c
index 2999214..2c1890f 100644
--- a/drivers/rtc/rtc-at32ap700x.c
+++ b/drivers/rtc/rtc-at32ap700x.c
@@ -167,7 +167,7 @@ static int at32_rtc_ioctl(struct device *dev, unsigned int cmd,

static irqreturn_t at32_rtc_interrupt(int irq, void *dev_id)
{
- struct rtc_at32ap700x *rtc = (struct rtc_at32ap700x *)dev_id;
+ struct rtc_at32ap700x *rtc = dev_id;
unsigned long isr = rtc_readl(rtc, ISR);
unsigned long events = 0;
int ret = IRQ_NONE;
diff --git a/drivers/rtc/rtc-bfin.c b/drivers/rtc/rtc-bfin.c
index 1aa709d..5afd24c 100644
--- a/drivers/rtc/rtc-bfin.c
+++ b/drivers/rtc/rtc-bfin.c
@@ -143,10 +143,11 @@ static irqreturn_t bfin_rtc_interrupt(int irq, void *dev_id)
struct bfin_rtc *rtc = platform_get_drvdata(pdev);
unsigned long events = 0;
u16 rtc_istat;
+ unsigned long flags;

stampit();

- spin_lock_irq(&rtc->lock);
+ spin_lock_irqsave(&rtc->lock, flags);

rtc_istat = bfin_read_RTC_ISTAT();

@@ -168,7 +169,7 @@ static irqreturn_t bfin_rtc_interrupt(int irq, void *dev_id)

rtc_update_irq(rtc->rtc_dev, 1, events);

- spin_unlock_irq(&rtc->lock);
+ spin_unlock_irqrestore(&rtc->lock, flags);

return IRQ_HANDLED;
}
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index bf60d35..934405d 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -283,7 +283,7 @@ static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
*/
static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
{
- struct device *dev = (struct device *)dev_id;
+ struct device *dev = dev_id;
struct platform_device *pdev = to_platform_device(dev);
struct m48t59_plat_data *pdata = pdev->dev.platform_data;
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
-
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