[PATCH 28/39] iwlwifi: workaround interrupt handling no some platforms

[Zhu Yi <yi.zhu@xxxxxxxxx>]

From: Tomas Winkler <tomas.winkler@xxxxxxxxx>

This patch adds workaround for an interrupt related hardware bug on
some platforms.

Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Zhu Yi <yi.zhu@xxxxxxxxx>
---
 drivers/net/wireless/iwlwifi/iwl-agn.c |    8 ++++++++
 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 aad0ddc..10980c7 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) {
-- 
1.5.3.6

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