linux-kernel - [ 145/175] gpio/davinci: fix enabling unbanked GPIO IRQs

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Message-Id: <20120330194855.469020132@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:50:50 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jon Povey <Jon.Povey@...elogic.co.uk>,
	Sekhar Nori <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: [ 145/175] gpio/davinci: fix enabling unbanked GPIO IRQs

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sekhar Nori <nsekhar@...com>

commit 81b279d80a63628e580c71a31d30a8c3b3047ad4 upstream.

Unbanked GPIO IRQ handling code made a copy of just
the irq_chip structure for GPIO IRQ lines which caused
problems after the generic IRQ chip conversion because
there was no valid irq_chip_type structure with the
right "regs" populated. irq_gc_mask_set_bit() was
therefore accessing random addresses.

Fix it by making a copy of irq_chip_type structure
instead. This will ensure sane register offsets.

Reported-by: Jon Povey <Jon.Povey@...elogic.co.uk>
Tested-by: Jon Povey <Jon.Povey@...elogic.co.uk>
Signed-off-by: Sekhar Nori <nsekhar@...com>
Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpio-davinci.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -386,7 +386,7 @@ static int __init davinci_gpio_irq_setup
 	 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
 	 */
 	if (soc_info->gpio_unbanked) {
-		static struct irq_chip gpio_irqchip_unbanked;
+		static struct irq_chip_type gpio_unbanked;
 
 		/* pass "bank 0" GPIO IRQs to AINTC */
 		chips[0].chip.to_irq = gpio_to_irq_unbanked;
@@ -394,9 +394,10 @@ static int __init davinci_gpio_irq_setup
 
 		/* AINTC handles mask/unmask; GPIO handles triggering */
 		irq = bank_irq;
-		gpio_irqchip_unbanked = *irq_get_chip(irq);
-		gpio_irqchip_unbanked.name = "GPIO-AINTC";
-		gpio_irqchip_unbanked.irq_set_type = gpio_irq_type_unbanked;
+		gpio_unbanked = *container_of(irq_get_chip(irq),
+					      struct irq_chip_type, chip);
+		gpio_unbanked.chip.name = "GPIO-AINTC";
+		gpio_unbanked.chip.irq_set_type = gpio_irq_type_unbanked;
 
 		/* default trigger: both edges */
 		g = gpio2regs(0);
@@ -405,7 +406,7 @@ static int __init davinci_gpio_irq_setup
 
 		/* set the direct IRQs up to use that irqchip */
 		for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) {
-			irq_set_chip(irq, &gpio_irqchip_unbanked);
+			irq_set_chip(irq, &gpio_unbanked.chip);
 			irq_set_handler_data(irq, &chips[gpio / 32]);
 			irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH);
 		}


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