linux-kernel - [PATCH] ARM: sa1100: Initialize gpio after gpio subsystem has been initialized

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Date:	Tue, 29 Mar 2016 11:15:49 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Russell King <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] ARM: sa1100: Initialize gpio after gpio subsystem has been initialized

The sa1100 gpio driver was initialized from interrupt initialization code,
which is earlier than the gpio subsystem is initialized. Since commit
ff2b13592299 ("gpio: make the gpiochip a real device"), this is fatal
and causes the system to crash.

The sa1100 gpio driver must be initialized prior to arch_initcall, since
its gpio pins are used in arch_initcall code, but after the gpio subsystem
is initialized (core_initcall). Initialize it with postcore_initcall.

Fixes: ff2b13592299 ("gpio: make the gpiochip a real device")
Cc: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---

Tested by building collie_defconfig and:

qemu-system-arm -M collie -kernel arch/arm/boot/zImage \
	-no-reboot -initrd busybox-armv4.cpio \
	--append "rdinit=/sbin/init console=ttySA1" -monitor null -nographic

 arch/arm/mach-sa1100/generic.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index 345e63f4eb71..850aa7f8f649 100644
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -321,6 +321,15 @@ static int __init sa1100_init(void)
 
 arch_initcall(sa1100_init);
 
+static int __init sa1100_gpio_init(void)
+{
+	sa1100_init_gpio();
+
+	return 0;
+}
+
+postcore_initcall(sa1100_gpio_init);
+
 void __init sa11x0_init_late(void)
 {
 	sa11x0_pm_init();
@@ -386,8 +395,6 @@ void __init sa1100_init_irq(void)
 	request_resource(&iomem_resource, &irq_resource);
 
 	sa11x0_init_irq_nodt(IRQ_GPIO0_SC, irq_resource.start);
-
-	sa1100_init_gpio();
 }
 
 /*
-- 
2.5.0