ARC: Reset the value of Interrupt Priority Register

In case bootloader has changed the priority of one/more IRQ lines

Reported-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index 5fc92455da36..02684e1a0cf0 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -39,10 +39,14 @@ void arc_init_IRQ(void)
         level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;
         level_mask |= IS_ENABLED(CONFIG_ARC_IRQ6_LV2) << 6;
 
-        if (level_mask) {
+        /*
+         * Write to register, even if no LV2 IRQs configured to reset it
+         * in case bootloader had mucked with it
+         */
+        write_aux_reg(AUX_IRQ_LEV, level_mask);
+
+        if (level_mask)
                 pr_info("Level-2 interrupts bitset %x\n", level_mask);
-                write_aux_reg(AUX_IRQ_LEV, level_mask);
-        }
 }
 
 /*