ath9k: AR9280 PCI devices must serialize IO as well

Cc: stable@kernel.org
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 5c870436fc5f..c38a00bbce64 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -687,7 +687,8 @@ static struct ath_hal *ath9k_hw_do_attach(u16 devid, struct ath_softc *sc,
         }
 
         if (ah->ah_config.serialize_regmode == SER_REG_MODE_AUTO) {
-                if (ah->ah_macVersion == AR_SREV_VERSION_5416_PCI) {
+                if (ah->ah_macVersion == AR_SREV_VERSION_5416_PCI ||
+                    (AR_SREV_9280(ah) && !ah->ah_isPciExpress)) {
                         ah->ah_config.serialize_regmode =
                                 SER_REG_MODE_ON;
                 } else {