[MIPS] ret_from_irq adjustment

Make sure that RA on top of interrupt stack is an address of ret_from_irq,
so that dump_stack etc. can trace info interrupted context.

Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which
seems broken.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/arch/mips/dec/int-handler.S b/arch/mips/dec/int-handler.S
index 55d60d5e0e86..31dd47d1002d 100644
--- a/arch/mips/dec/int-handler.S
+++ b/arch/mips/dec/int-handler.S
@@ -266,10 +266,8 @@
 handle_it:
                 LONG_L  s0, TI_REGS($28)
                 LONG_S  sp, TI_REGS($28)
-                jal     do_IRQ
-                LONG_S  s0, TI_REGS($28)
-
-                j       ret_from_irq
+                PTR_LA  ra, ret_from_irq
+                j       do_IRQ
                  nop
 
 #ifdef CONFIG_32BIT
@@ -279,9 +277,8 @@ fpu:
 #endif
 
 spurious:
-                jal     spurious_interrupt
-                 nop
-                j       ret_from_irq
+                PTR_LA  ra, _ret_from_irq
+                j       spurious_interrupt
                  nop
                 END(plat_irq_dispatch)