ath9k: Fix panic on driver load

The device has to be marked as invalid before
registering the ISR. HW initialization takes place
after the ISR has been registered, and the invalid
flag is eventually cleared in the ->stop() callback.

Reported-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/pci.c

@@ -198,6 +198,9 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	sc->dev = &pdev->dev;
 	sc->mem = mem;
 
+	/* Will be cleared in ath9k_start() */
+	sc->sc_flags |= SC_OP_INVALID;
+
 	ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed\n");