MIPS: Alchemy: handle db1200 cpld ints as they come in

Remove the loop in the cascade handler and instead unconditionally
handle just the first set interrupt coming from the CPLD.

This gets rid of a lot of spurious interrupts being triggered for
the SMSC91111 ethernet chip especially under high(er) IDE load:
"eth0: spurious interrupt (mask = 0xb3)"

Verified on DB1200 and DB1300.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3288/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/alchemy/devboards/bcsr.c

@@ -90,10 +90,7 @@ static void bcsr_csc_handler(unsigned int irq, struct irq_desc *d)
 	unsigned short bisr = __raw_readw(bcsr_virt + BCSR_REG_INTSTAT);
 
 	disable_irq_nosync(irq);
-
-	for ( ; bisr; bisr &= bisr - 1)
-		generic_handle_irq(bcsr_csc_base + __ffs(bisr));
-
+	generic_handle_irq(bcsr_csc_base + __ffs(bisr));
 	enable_irq(irq);
 }