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/ahb.c

@@ -121,6 +121,9 @@ static int ath_ahb_probe(struct platform_device *pdev)
 	sc->mem = mem;
 	sc->irq = irq;
 
+	/* Will be cleared in ath9k_start() */
+	sc->sc_flags |= SC_OP_INVALID;
+
 	ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed\n");

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

@@ -534,8 +534,6 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
 	int ret = 0, i;
 	int csz = 0;
 
-	sc->sc_flags |= SC_OP_INVALID;
-
 	ah = kzalloc(sizeof(struct ath_hw), GFP_KERNEL);
 	if (!ah)
 		return -ENOMEM;

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");