ath9k: Re-enable interrupts after a channel change failure

ath_complete_reset will not be called if ath9k_hw_reset is unsuccessful, so we need to re-enable intertupts to balence the previous ath_prepare_reset call. Also schedule a reset as a best effort method to recover the chip from whatever state caused the channel change failure.

Fixes https://bugzilla.kernel.org/show_bug.cgi?id=55771

---
V2
- (hopefully) Fixed whitespace issues
- Removed call to ath9k_hw_set_interrupts

---
 drivers/net/wireless/ath/ath9k/main.c | 4 ++++
 1 file changed, 4 insertions(+)

index 24650fd4..83608be 100644
@@ -280,6 +280,10 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
 	if (r) {
 		ath_err(common,
 			"Unable to reset channel, reset status %d\n", r);
+
+		ath9k_hw_enable_interrupts(ah);
+		ath9k_queue_reset(sc, RESET_TYPE_BB_HANG);
+
 		goto out;
 	}
 

1.8.2