[tip:irq/core] genirq, ARM: Fix boot on ARM platforms

[tip-bot for Anand Gadiyar]

Commit-ID:  05d0ca85c91013d5f73c43fb566bde09a9718019
Gitweb:     http://git.kernel.org/tip/05d0ca85c91013d5f73c43fb566bde09a9718019
Author:     Anand Gadiyar <gadiyar@xxxxxx>
AuthorDate: Thu, 14 Oct 2010 22:59:57 +0530
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sat, 16 Oct 2010 18:22:03 +0200

genirq, ARM: Fix boot on ARM platforms

Commit b683de2b3 in linux-next as of 20101014 (genirq: Query
arch for number of early descriptors) seems to have broken
bootup on several ARM boards - my beagleboard gives the
following dump with earlyprintk:

 NR_IRQS:402
 Unable to handle kernel NULL pointer dereference at virtual
 address 00000028 pgd = c0004000
 [00000028] *pgd=00000000
 Internal error: Oops: 5 [#1]
 last sysfs file:
 Modules linked in:
 CPU: 0    Not tainted
 (2.6.36-rc7-next-20101014-linux-next-20101012+ #40) PC is at
 init_IRQ+0x14/0x48 LR is at start_kernel+0x150/0x2c0
 [...]

We seem to be using desc->status without assigning desc to
anything. Fix this by adding back the code that was originally
there.

Signed-off-by: Anand Gadiyar <gadiyar@xxxxxx>
Tested-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
LKML-Reference: <1287077397-21781-1-git-send-email-gadiyar@xxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 arch/arm/kernel/irq.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 5456d11..0e65d7e 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -157,8 +157,10 @@ void __init init_IRQ(void)
 	struct irq_desc *desc;
 	int irq;
 
-	for (irq = 0; irq < nr_irqs; irq++)
+	for (irq = 0; irq < nr_irqs; irq++) {
+		desc = irq_to_desc_alloc_node(irq, 0);
 		desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
+	}
 
 	init_arch_irq();
 }
--
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