iwlwifi: workaround interrupt handling no some platforms

This patch adds workaround for an interrupt related hardware bug on
some platforms.  (Apparently these platforms boot-up w/ INTX_DISABLED
set. -- JWL)

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 061ffba9c884..c0b73c4d6f44 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2602,6 +2602,7 @@ static int iwl4965_mac_start(struct ieee80211_hw *hw)
 {
         struct iwl_priv *priv = hw->priv;
         int ret;
+        u16 pci_cmd;
 
         IWL_DEBUG_MAC80211("enter\n");
 
@@ -2612,6 +2613,13 @@ static int iwl4965_mac_start(struct ieee80211_hw *hw)
         pci_restore_state(priv->pci_dev);
         pci_enable_msi(priv->pci_dev);
 
+        /* enable interrupts if needed: hw bug w/a */
+        pci_read_config_word(priv->pci_dev, PCI_COMMAND, &pci_cmd);
+        if (pci_cmd & PCI_COMMAND_INTX_DISABLE) {
+                pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
+                pci_write_config_word(priv->pci_dev, PCI_COMMAND, pci_cmd);
+        }
+
         ret = request_irq(priv->pci_dev->irq, iwl4965_isr, IRQF_SHARED,
                           DRV_NAME, priv);
         if (ret) {