wcn36xx: Fix packet drop on resume

[ Upstream commit df0697801d8aa2eebfe7f0b7388879639f8fe7cc ]

If the system is resumed because of an incoming packet, the wcn36xx RX
interrupts is fired before actual resuming of the wireless/mac80211
stack, causing any received packets to be simply dropped. E.g. a ping
request causes a system resume, but is dropped and so never forwarded
to the IP stack.

This change fixes that, disabling DMA interrupts on suspend to no pass
packets until mac80211 is resumed and ready to handle them.

Note that it's not incompatible with RX irq wake.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1635150496-19290-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index bd1c83aeea60679fb92cb290aa666ed274826cea..39d86e3031bd7e7bc5d1515c90386284486533ab 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -1115,6 +1115,13 @@ static int wcn36xx_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wow)
                        goto out;
                ret = wcn36xx_smd_wlan_host_suspend_ind(wcn);
        }
+
+       /* Disable IRQ, we don't want to handle any packet before mac80211 is
+        * resumed and ready to receive packets.
+        */
+       disable_irq(wcn->tx_irq);
+       disable_irq(wcn->rx_irq);
+
 out:
        mutex_unlock(&wcn->conf_mutex);
        return ret;
@@ -1137,6 +1144,10 @@ static int wcn36xx_resume(struct ieee80211_hw *hw)
                wcn36xx_smd_ipv6_ns_offload(wcn, vif, false);
                wcn36xx_smd_arp_offload(wcn, vif, false);
        }
+
+       enable_irq(wcn->tx_irq);
+       enable_irq(wcn->rx_irq);
+
        mutex_unlock(&wcn->conf_mutex);
 
        return 0;