Fix interrupt clearing in kdump shutdown sequence

Mohan Kumar M mohan at
Tue Sep 12 22:18:21 EST 2006


Some times HVC console on a PPC machine may have pending interrupts and
in this case kdump shutdown sequence created problem by calling
chip->end. This should be chip->eoi(). The attached patch fixes this
issue. Tested on POWER5 box.

Patch generated on 2.6.18-rc6-git4.

It will be helpful if this patch is included in 2.6.18.


Call chip->eoi(irq) to clear any pending interrupt in case of kdump shutdown
sequence. chip->end(irq) does not solve this purpose.

Signed-off-by: Mohan Kumar M <mohan at>

 linux-2.6.18-rc6-git4/arch/powerpc/kernel/crash.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN linux-2.6.18-rc6-git4/arch/powerpc/kernel/crash.c~kdump-irq-fix linux-2.6.18-rc6-git4/arch/powerpc/kernel/crash.c
--- kernel/linux-2.6.18-rc6-git4/arch/powerpc/kernel/crash.c~kdump-irq-fix	2006-09-12 17:20:39.000000000 +0530
+++ kernel-mohan/linux-2.6.18-rc6-git4/arch/powerpc/kernel/crash.c	2006-09-12 17:20:51.000000000 +0530
@@ -295,7 +295,7 @@ void default_machine_crash_shutdown(stru
 		struct irq_desc *desc = irq_desc + irq;
 		if (desc->status & IRQ_INPROGRESS)
-			desc->chip->end(irq);
+			desc->chip->eoi(irq);
 		if (!(desc->status & IRQ_DISABLED))

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