linux-kernel - Re: 32-rc1 aka 32-rc2: warning at manage.c:361 (set_irq

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Message-ID: <20091203031709.GE9121@core.coreip.homeip.net>
Date:	Wed, 2 Dec 2009 19:17:09 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Eric Miao <eric.y.miao@...il.com>, rpurdie@...ys.net,
	lenz@...wisc.edu, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	dbaryshkov@...il.com, omegamoon@...il.com, utx@...guin.cz,
	linux-input@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 32-rc1 aka 32-rc2: warning at manage.c:361 (set_irq_wake),
	matrix-keypad related?

On Wed, Oct 07, 2009 at 11:12:26PM +0200, Pavel Machek wrote:
> 
> > > > OK, so it looks like your box refuses to set up one of the GPIOs as a
> > > > wakeup source... Hmm, either your box is wrong ;) or matrix_keypad
> > > > driver needs to maintain a separate list of wakeup GPIOs.
> > > >
> > > 
> > > This is due to the nature of PXA processor, where not every GPIO can
> > > be configured as a wakeup source. Mmm.... we can either return a
> > > pseudo value indicating setting wakeup on that GPIO is OK (which
> > > doesn't sound like a good idea), or we can just ignore the failure of
> > > enable_irq_wake() in matrix_keypad?
> > 
> > We ignore the failure right now in the mainline but that causes stack
> > traces on resume as we trying to disable not enabled wakeup GPIOs. That
> > was original Pavel's complaint.
> 
> Yep...
> 
> I'd say that BUG() simply should not trigger if wakeup can not be
> enabled/disabled for particular source...?

Pavel,

Could you please try the patch below and let me know if it fixes the
problem for you?

Thanks.

-- 
Dmitry

Input: matrix-keypad - handle cases when GPIOs can't be wakeup sources

From: Dmitry Torokhov <dmitry.torokhov@...il.com>

Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
---

 drivers/input/keyboard/matrix_keypad.c |   29 ++++++++++++++++++++++-------
 1 files changed, 22 insertions(+), 7 deletions(-)


diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
index 91cfe51..a1152ba 100644
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -29,11 +29,13 @@ struct matrix_keypad {
 	unsigned short *keycodes;
 	unsigned int row_shift;
 
+	DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
+
 	uint32_t last_key_state[MATRIX_MAX_COLS];
 	struct delayed_work work;
+	spinlock_t lock;
 	bool scan_pending;
 	bool stopped;
-	spinlock_t lock;
 };
 
 /*
@@ -221,9 +223,16 @@ static int matrix_keypad_suspend(struct platform_device *pdev, pm_message_t stat
 
 	matrix_keypad_stop(keypad->input_dev);
 
-	if (device_may_wakeup(&pdev->dev))
-		for (i = 0; i < pdata->num_row_gpios; i++)
-			enable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
+	if (device_may_wakeup(&pdev->dev)) {
+		for (i = 0; i < pdata->num_row_gpios; i++) {
+			if (!test_bit(i, keypad->disabled_gpios)) {
+				unsigned int gpio = pdata->row_gpios[i];
+
+				if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
+					__set_bit(i, keypad->disabled_gpios);
+			}
+		}
+	}
 
 	return 0;
 }
@@ -234,9 +243,15 @@ static int matrix_keypad_resume(struct platform_device *pdev)
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
 	int i;
 
-	if (device_may_wakeup(&pdev->dev))
-		for (i = 0; i < pdata->num_row_gpios; i++)
-			disable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
+	if (device_may_wakeup(&pdev->dev)) {
+		for (i = 0; i < pdata->num_row_gpios; i++) {
+			if (test_and_clear_bit(i, keypad->disabled_gpios)) {
+				unsigned int gpio = pdata->row_gpios[i];
+
+				disable_irq_wake(gpio_to_irq(gpio));
+			}
+		}
+	}
 
 	matrix_keypad_start(keypad->input_dev);
 
--
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