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r6040: save and restore MIER correctly in the interrupt routine

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This patch saves the MIER register contents before treating
interrupts, then restores them correcty at the end of the
interrupt routine.

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>
This commit is contained in:
Joe Chou 2008-12-22 19:40:02 -08:00 committed by David S. Miller
parent 11e5e8f5d1
commit 3e7c469f07
1 changed files with 7 additions and 2 deletions
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9
drivers/net/r6040.c
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@ -680,8 +680,10 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
struct net_device *dev = dev_id;
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;
u16 status;
u16 misr, status;
/* Save MIER */
misr = ioread16(ioaddr + MIER);
/* Mask off RDC MAC interrupt */
iowrite16(MSK_INT, ioaddr + MIER);
/* Read MISR status and clear */
@ -701,7 +703,7 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
dev->stats.rx_fifo_errors++;
/* Mask off RX interrupt */
iowrite16(ioread16(ioaddr + MIER) & ~RX_INTS, ioaddr + MIER);
misr &= ~RX_INTS;
netif_rx_schedule(dev, &lp->napi);
}
@ -709,6 +711,9 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
if (status & TX_INTS)
r6040_tx(dev);
/* Restore RDC MAC interrupt */
iowrite16(misr, ioaddr + MIER);
return IRQ_HANDLED;
}