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author	Felix Fietkau <nbd@openwrt.org>	2009-06-01 22:14:11 +0000
committer	Felix Fietkau <nbd@openwrt.org>	2009-06-01 22:14:11 +0000
commit	616c3841c6767a8cfa5fd79a6842d6208943d426 (patch)
tree	95796b79249df1624205fea258a8c575e6820ee2 /package/ixp4xx-microcode/src
parent	569330c102a664c9ad8b936e00974031eca6e985 (diff)
download	upstream-616c3841c6767a8cfa5fd79a6842d6208943d426.tar.gz upstream-616c3841c6767a8cfa5fd79a6842d6208943d426.tar.bz2 upstream-616c3841c6767a8cfa5fd79a6842d6208943d426.zip

add ip175c switch driver patch to 2.6.30

SVN-Revision: 16287

Diffstat (limited to 'package/ixp4xx-microcode/src')

0 files changed, 0 insertions, 0 deletions

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From: Matt Redfearn <matt.redfearn@imgtec.com>
Date: Mon, 19 Dec 2016 14:20:57 +0000
Subject: [PATCH] MIPS: Stack unwinding while on IRQ stack

Within unwind stack, check if the stack pointer being unwound is within
the CPU's irq_stack and if so use that page rather than the task's stack
page.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
---

--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -32,6 +32,7 @@
 #include <asm/cpu.h>
 #include <asm/dsp.h>
 #include <asm/fpu.h>
+#include <asm/irq.h>
 #include <asm/msa.h>
 #include <asm/pgtable.h>
 #include <asm/mipsregs.h>
@@ -552,7 +553,19 @@ EXPORT_SYMBOL(unwind_stack_by_address);
 unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
 			   unsigned long pc, unsigned long *ra)
 {
-	unsigned long stack_page = (unsigned long)task_stack_page(task);
+	unsigned long stack_page = 0;
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		if (on_irq_stack(cpu, *sp)) {
+			stack_page = (unsigned long)irq_stack[cpu];
+			break;
+		}
+	}
+
+	if (!stack_page)
+		stack_page = (unsigned long)task_stack_page(task);
+
 	return unwind_stack_by_address(stack_page, sp, pc, ra);
 }
 #endif


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