[PATCH] Improve interrupt latency again for sb1250/bcm1480

[PATCH] Improve interrupt latency again for sb1250/bcm1480

[Thiemo Seufer]

Hello All,

this patch restores the behaviour of the old (assembly-written)
interrupt handler, the handler is left as soon as a single interrupt
cause is handled.


Thiemo


diff --git a/arch/mips/sibyte/bcm1480/irq.c b/arch/mips/sibyte/bcm1480/irq.c
index 0eb0b10..ed325f0 100644
--- a/arch/mips/sibyte/bcm1480/irq.c
+++ b/arch/mips/sibyte/bcm1480/irq.c
@@ -502,22 +502,23 @@ #endif
 #ifdef CONFIG_SIBYTE_BCM1480_PROF
 	if (pending & CAUSEF_IP7)	/* Cpu performance counter interrupt */
 		sbprof_cpu_intr(exception_epc(regs));
+	else
 #endif
 
 	if (pending & CAUSEF_IP4)
 		bcm1480_timer_interrupt(regs);
 
 #ifdef CONFIG_SMP
-	if (pending & CAUSEF_IP3)
+	else if (pending & CAUSEF_IP3)
 		bcm1480_mailbox_interrupt(regs);
 #endif
 
 #ifdef CONFIG_KGDB
-	if (pending & CAUSEF_IP6)
+	else if (pending & CAUSEF_IP6)
 		bcm1480_kgdb_interrupt(regs);		/* KGDB (uart 1) */
 #endif
 
-	if (pending & CAUSEF_IP2) {
+	else if (pending & CAUSEF_IP2) {
 		unsigned long long mask_h, mask_l;
 		unsigned long base;
 
diff --git a/arch/mips/sibyte/sb1250/irq.c b/arch/mips/sibyte/sb1250/irq.c
index 8d49cb5..1de71ad 100644
--- a/arch/mips/sibyte/sb1250/irq.c
+++ b/arch/mips/sibyte/sb1250/irq.c
@@ -460,25 +460,25 @@ #endif
 	pending = read_c0_cause();
 
 #ifdef CONFIG_SIBYTE_SB1250_PROF
-	if (pending & CAUSEF_IP7) { /* Cpu performance counter interrupt */
+	if (pending & CAUSEF_IP7) /* Cpu performance counter interrupt */
 		sbprof_cpu_intr(exception_epc(regs));
-	}
+	else
 #endif
 
 	if (pending & CAUSEF_IP4)
 		sb1250_timer_interrupt(regs);
 
 #ifdef CONFIG_SMP
-	if (pending & CAUSEF_IP3)
+	else if (pending & CAUSEF_IP3)
 		sb1250_mailbox_interrupt(regs);
 #endif
 
 #ifdef CONFIG_KGDB
-	if (pending & CAUSEF_IP6)			/* KGDB (uart 1) */
+	else if (pending & CAUSEF_IP6)			/* KGDB (uart 1) */
 		sb1250_kgdb_interrupt(regs);
 #endif
 
-	if (pending & CAUSEF_IP2) {
+	else if (pending & CAUSEF_IP2) {
 		unsigned long long mask;
 
 		/*