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Subject[patch 06/40] r6040: save and restore MIER correctly in the interrupt routine
2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Joe Chou <Joe.Chou@rdc.com.tw>

[ Upstream commit: 3e7c469f07ff14cbf9a814739e1fc99a863e0943 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/r6040.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -681,8 +681,10 @@ static irqreturn_t r6040_interrupt(int i
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 */
@@ -702,7 +704,7 @@ static irqreturn_t r6040_interrupt(int i
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);
}

@@ -710,6 +712,9 @@ static irqreturn_t r6040_interrupt(int i
if (status & TX_INTS)
r6040_tx(dev);

+ /* Restore RDC MAC interrupt */
+ iowrite16(misr, ioaddr + MIER);
+
return IRQ_HANDLED;
}



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