ath9k: remove dummy PCI "retry timeout" fix

Remove the PCI retry timeout code as that was just taken from ipw2100
due to historical reasons but in reality its a no-op, additionally its
simply incorrect as each PCI devices has its own custom PCI configuration
space on PCI config space >= 0x40. Not to mention we were trying to write
0 to a place that already has 0 on it.

Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Ben Cahill <ben.m.cahill@intel.com>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Tested-by: Adel Gadllah <adel.gadllah@gmail.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/pci.c

@@ -87,7 +87,6 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	struct ath_softc *sc;
 	struct ieee80211_hw *hw;
 	u8 csz;
-	u32 val;
 	int ret = 0;
 	struct ath_hw *ah;
 
@@ -134,14 +133,6 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	pci_set_master(pdev);
 
-	/*
-	 * Disable the RETRY_TIMEOUT register (0x41) to keep
-	 * PCI Tx retries from interfering with C3 CPU state.
-	 */
-	pci_read_config_dword(pdev, 0x40, &val);
-	if ((val & 0x0000ff00) != 0)
-		pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);
-
 	ret = pci_request_region(pdev, 0, "ath9k");
 	if (ret) {
 		dev_err(&pdev->dev, "PCI memory region reserve error\n");
@@ -253,21 +244,12 @@ static int ath_pci_resume(struct pci_dev *pdev)
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;
-	u32 val;
 	int err;
 
 	err = pci_enable_device(pdev);
 	if (err)
 		return err;
 	pci_restore_state(pdev);
-	/*
-	 * Suspend/Resume resets the PCI configuration space, so we have to
-	 * re-disable the RETRY_TIMEOUT register (0x41) to keep
-	 * PCI Tx retries from interfering with C3 CPU state
-	 */
-	pci_read_config_dword(pdev, 0x40, &val);
-	if ((val & 0x0000ff00) != 0)
-		pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);
 
 	/* Enable LED */
 	ath9k_hw_cfg_output(sc->sc_ah, ATH_LED_PIN,