[patch 088/108] ath5k: avoid PCI FATAL interrupts by restoring RETRY_TIMEOUT disabling

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

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

From: Jouni Malinen <jouni.malinen@xxxxxxxxxxx>

commit 8451d22dad40a66416b8d9c0952efa09ec5398c5 upstream.

This reverts 'ath5k: remove dummy PCI "retry timeout" fix' on the
same theory as in 'ath9k: Fix PCI FATAL interrupts by restoring
RETRY_TIMEOUT disabling'.

Reported-by: Bob Copeland <me@xxxxxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/ath5k/base.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -685,6 +685,13 @@ ath5k_pci_resume(struct pci_dev *pdev)
 	if (err)
 		return err;
 
+	/*
+	 * 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_write_config_byte(pdev, 0x41, 0);
+
 	err = request_irq(pdev->irq, ath5k_intr, IRQF_SHARED, "ath", sc);
 	if (err) {
 		ATH5K_ERR(sc, "request_irq failed\n");


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