[MIPS] SMTC: Make ack_bad_irq() safe with no IM backstop.

Issue reported and original patch by Kevin Kissel, cleaner (imho)
implementation by me.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 1 insertions, 4 deletions

diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index b6c30800c667..3a2d255361bc 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -177,10 +177,7 @@ handle_real_irq:
                 outb(cached_master_mask, PIC_MASTER_IMR);
                 outb(0x60+irq,PIC_MASTER_CMD);  /* 'Specific EOI to master */
         }
-#ifdef CONFIG_MIPS_MT_SMTC
-        if (irq_hwmask[irq] & ST0_IM)
-                set_c0_status(irq_hwmask[irq] & ST0_IM);
-#endif /* CONFIG_MIPS_MT_SMTC */
+        smtc_im_ack_irq(irq);
         spin_unlock_irqrestore(&i8259A_lock, flags);
         return;