ath9k: ensure that rx is not enabled during a reset

During a reset, rx buffers are flushed after rx has been disabled. To avoid
race conditions, rx needs to stay disabled during the reset, so avoid any
calls to ath9k_hw_rxena in that case.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -247,8 +247,8 @@ static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
 
 	if (!flush) {
 		if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
-			ath_rx_tasklet(sc, 0, true);
-		ath_rx_tasklet(sc, 0, false);
+			ath_rx_tasklet(sc, 1, true);
+		ath_rx_tasklet(sc, 1, false);
 	} else {
 		ath_flushrecv(sc);
 	}

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

@@ -1839,7 +1839,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		 * If we're asked to flush receive queue, directly
 		 * chain it back at the queue without processing it.
 		 */
-		if (flush)
+		if (sc->sc_flags & SC_OP_RXFLUSH)
 			goto requeue_drop_frag;
 
 		retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
@@ -1967,7 +1967,8 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		} else {
 			list_move_tail(&bf->list, &sc->rx.rxbuf);
 			ath_rx_buf_link(sc, bf);
-			ath9k_hw_rxena(ah);
+			if (!flush)
+				ath9k_hw_rxena(ah);
 		}
 	} while (1);