ath9k: Fix IRQ nobody cared issue with ath9k

IRQs should be disabled before calling free_irq. Also flush pending
IRQs. Pasted the kernel log message for reference.

kernel: irq 17: nobody cared (try booting with the "irqpoll" option)
kernel:  [<c0252d2c>] __report_bad_irq+0x2e/0x6f
kernel:  [<c0252f22>] note_interrupt+0x1b5/0x207
kernel:  [<c025258b>] ? handle_IRQ_event+0x21/0x48
kernel:  [<c02534cb>] handle_fasteoi_irq+0x8e/0xad
kernel:  [<c0205650>] do_IRQ+0x6c/0x84
kernel:  [<c020425f>] common_interrupt+0x23/0x28
kernel:  [<c034f6f6>] ? acpi_idle_enter_simple+0x198/0x205
kernel:  [<c044686c>] ? menu_select+0x5c/0x78
kernel:  [<c0445a95>] cpuidle_idle_call+0x59/0x89
kernel:  [<c02029d7>] cpu_idle+0xae/0xcf
kernel:  [<c0543102>] rest_init+0x4e/0x50
kernel:  =======================
kernel: handlers:
kernel: [<f88fdd26>] (ath_isr+0x0/0x13a [ath9k])
kernel: Disabling IRQ #17

Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Tested-by: Steven Noonan <steven@uplinklabs.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 10 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath9k/core.c b/drivers/net/wireless/ath9k/core.c
index f6c45288d0e7..c04959357bda 100644
--- a/drivers/net/wireless/ath9k/core.c
+++ b/drivers/net/wireless/ath9k/core.c
@@ -294,8 +294,6 @@ static int ath_stop(struct ath_softc *sc)
          * hardware is gone (invalid).
          */
 
-        if (!sc->sc_invalid)
-                ath9k_hw_set_interrupts(ah, 0);
         ath_draintxq(sc, false);
         if (!sc->sc_invalid) {
                 ath_stoprecv(sc);
@@ -1336,6 +1334,8 @@ void ath_deinit(struct ath_softc *sc)
 
         DPRINTF(sc, ATH_DBG_CONFIG, "%s\n", __func__);
 
+        tasklet_kill(&sc->intr_tq);
+        tasklet_kill(&sc->bcon_tasklet);
         ath_stop(sc);
         if (!sc->sc_invalid)
                 ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 099719649c98..acebdf1d20a8 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1411,10 +1411,17 @@ static void ath_pci_remove(struct pci_dev *pdev)
 {
         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
         struct ath_softc *sc = hw->priv;
+        enum ath9k_int status;
 
-        if (pdev->irq)
+        if (pdev->irq) {
+                ath9k_hw_set_interrupts(sc->sc_ah, 0);
+                /* clear the ISR */
+                ath9k_hw_getisr(sc->sc_ah, &status);
+                sc->sc_invalid = 1;
                 free_irq(pdev->irq, sc);
+        }
         ath_detach(sc);
+
         pci_iounmap(pdev, sc->mem);
         pci_release_region(pdev, 0);
         pci_disable_device(pdev);