sky2: fix hang in napi_disable

If IRQ was never initialized, then calling napi_disable() would hang.
Add more bookkeeping to track whether IRQ was ever initialized.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index d996871..7803efa 100644 (file)
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -1723,6 +1723,8 @@ static int sky2_setup_irq(struct sky2_hw *hw, const char *name)
        if (err)
                dev_err(&pdev->dev, "cannot assign irq %d\n", pdev->irq);
        else {
+               hw->flags |= SKY2_HW_IRQ_SETUP;
+
                napi_enable(&hw->napi);
                sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
                sky2_read32(hw, B0_IMSK);
@@ -2120,6 +2122,7 @@ static int sky2_close(struct net_device *dev)
 
                napi_disable(&hw->napi);
                free_irq(hw->pdev->irq, hw);
+               hw->flags &= ~SKY2_HW_IRQ_SETUP;
        } else {
                u32 imask;
 
@@ -3423,12 +3426,13 @@ static void sky2_all_down(struct sky2_hw *hw)
 {
        int i;
 
-       sky2_read32(hw, B0_IMSK);
-       sky2_write32(hw, B0_IMSK, 0);
+       if (hw->flags & SKY2_HW_IRQ_SETUP) {
+               sky2_read32(hw, B0_IMSK);
+               sky2_write32(hw, B0_IMSK, 0);
 
-       if (hw->ports > 1 || netif_running(hw->dev[0]))
                synchronize_irq(hw->pdev->irq);
-       napi_disable(&hw->napi);
+               napi_disable(&hw->napi);
+       }
 
        for (i = 0; i < hw->ports; i++) {
                struct net_device *dev = hw->dev[i];
@@ -3445,7 +3449,7 @@ static void sky2_all_down(struct sky2_hw *hw)
 
 static void sky2_all_up(struct sky2_hw *hw)
 {
-       u32 imask = 0;
+       u32 imask = Y2_IS_BASE;
        int i;
 
        for (i = 0; i < hw->ports; i++) {
@@ -3461,8 +3465,7 @@ static void sky2_all_up(struct sky2_hw *hw)
                netif_wake_queue(dev);
        }
 
-       if (imask || hw->ports > 1) {
-               imask |= Y2_IS_BASE;
+       if (hw->flags & SKY2_HW_IRQ_SETUP) {
                sky2_write32(hw, B0_IMSK, imask);
                sky2_read32(hw, B0_IMSK);
                sky2_read32(hw, B0_Y2_SP_LISR);

diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
index 0af31b8..ff6f58b 100644 (file)
--- a/drivers/net/ethernet/marvell/sky2.h
+++ b/drivers/net/ethernet/marvell/sky2.h
@@ -2287,6 +2287,7 @@ struct sky2_hw {
 #define SKY2_HW_RSS_BROKEN     0x00000100
 #define SKY2_HW_VLAN_BROKEN     0x00000200
 #define SKY2_HW_RSS_CHKSUM     0x00000400      /* RSS requires chksum */
+#define SKY2_HW_IRQ_SETUP      0x00000800
 
        u8                   chip_id;
        u8                   chip_rev;