r6040: restore MIER register correctly when IRQ line is shared

When the r6040 device IRQ line is shared we will enter the driver
interrupt service routine, mask off the device interrupt enable
register (MIER) and return with IRQ_NONE, we would then leave the
device with interrupts disabled, this patch fixes that issue.

Reported-by: Steve Holland <sdh4@iastate.edu>
Signed-off-by: Joe Chou <joe.chou@rdc.com.tw>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
index ed63d23a645233f9da9a6e88abb51632fdf5f98d..70aac35dc2dbb36659b716ca9c9d777a61dcc290 100644 (file)
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -704,8 +704,11 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
        /* Read MISR status and clear */
        status = ioread16(ioaddr + MISR);
 
-       if (status == 0x0000 || status == 0xffff)
+       if (status == 0x0000 || status == 0xffff) {
+               /* Restore RDC MAC interrupt */
+               iowrite16(misr, ioaddr + MIER);
                return IRQ_NONE;
+       }
 
        /* RX interrupt request */
        if (status & RX_INTS) {