[MIPS] unwind_stack(): return ra if an exception occured at the first instruction

Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 951bf9ca3ce9..e7b0b385fb2b 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -465,8 +465,11 @@ unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
 
         if (!kallsyms_lookup(pc, &size, &ofs, &modname, namebuf))
                 return 0;
-        if (ofs == 0)
-                return 0;
+        /*
+         * Return ra if an exception occured at the first instruction
+         */
+        if (unlikely(ofs == 0))
+                return ra;
 
         info.func = (void *)(pc - ofs);
         info.func_size = ofs;   /* analyze from start to ofs */