[MIPS] Sibyte: Improve interrupt latency again for sb1250/bcm1480

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.

Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/sibyte/bcm1480/irq.c b/arch/mips/sibyte/bcm1480/irq.c
index 2c5afb4..cab78fb 100644 (file)
--- a/arch/mips/sibyte/bcm1480/irq.c
+++ b/arch/mips/sibyte/bcm1480/irq.c
@@ -502,22 +502,23 @@ asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 #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 (file)
--- a/arch/mips/sibyte/sb1250/irq.c
+++ b/arch/mips/sibyte/sb1250/irq.c
@@ -460,25 +460,25 @@ asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
        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;
 
                /*