linux-kernel - [PATCH 1/2] rtc: twl: Use threaded IRQ, remove IRQ enable in interrupt handler

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Date:	Wed, 27 Jul 2011 00:07:20 -0700
From:	Todd Poynor <toddpoynor@...gle.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	rtc-linux@...glegroups.com, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, Todd Poynor <toddpoynor@...gle.com>
Subject: [PATCH 1/2] rtc: twl: Use threaded IRQ, remove IRQ enable in interrupt handler

IRQs disabled on entry to twl_rtc_interrupt is not a consequence
of LOCKDEP; both twl6030 and twl4030 explicitly disable IRQs
before calling the module IRQ handlers.

The ISR should not be enabling IRQs; use a threaded IRQ handler
instead.

Also fixes warnings:

  WARNING: at kernel/irq/handle.c:130 handle_irq_event_percpu+nnn
  irq nnn handler twl_rtc_interrupt+nnn enabled interrupts

Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/rtc/rtc-twl.c |   14 +++-----------
 1 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
index 9a81f77..ece41b9 100644
--- a/drivers/rtc/rtc-twl.c
+++ b/drivers/rtc/rtc-twl.c
@@ -362,14 +362,6 @@ static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
 	int res;
 	u8 rd_reg;
 
-#ifdef CONFIG_LOCKDEP
-	/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
-	 * we don't want and can't tolerate.  Although it might be
-	 * friendlier not to borrow this thread context...
-	 */
-	local_irq_enable();
-#endif
-
 	res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 	if (res)
 		goto out;
@@ -462,9 +454,9 @@ static int __devinit twl_rtc_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto out1;
 
-	ret = request_irq(irq, twl_rtc_interrupt,
-				IRQF_TRIGGER_RISING,
-				dev_name(&rtc->dev), rtc);
+	ret = request_threaded_irq(irq, NULL, twl_rtc_interrupt,
+				   IRQF_TRIGGER_RISING,
+				   dev_name(&rtc->dev), rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "IRQ is not free.\n");
 		goto out1;
-- 
1.7.3.1

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