[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, 2 insertions, 8 deletions

diff --git a/arch/mips/kernel/irq-msc01.c b/arch/mips/kernel/irq-msc01.c
index 410868b5ea5f..1ecdd50bfc60 100644
--- a/arch/mips/kernel/irq-msc01.c
+++ b/arch/mips/kernel/irq-msc01.c
@@ -52,11 +52,8 @@ static void level_mask_and_ack_msc_irq(unsigned int irq)
         mask_msc_irq(irq);
         if (!cpu_has_veic)
                 MSCIC_WRITE(MSC01_IC_EOI, 0);
-#ifdef CONFIG_MIPS_MT_SMTC
         /* This actually needs to be a call into platform code */
-        if (irq_hwmask[irq] & ST0_IM)
-                set_c0_status(irq_hwmask[irq] & ST0_IM);
-#endif /* CONFIG_MIPS_MT_SMTC */
+        smtc_im_ack_irq(irq);
 }
 
 /*
@@ -73,10 +70,7 @@ static void edge_mask_and_ack_msc_irq(unsigned int irq)
                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
         }
-#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);
 }
 
 /*