From df0697801d8aa2eebfe7f0b7388879639f8fe7cc Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Mon, 25 Oct 2021 10:28:16 +0200 Subject: [PATCH] wcn36xx: Fix packet drop on resume 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 Reviewed-by: Bryan O'Donoghue Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/1635150496-19290-1-git-send-email-loic.poulain@linaro.org --- drivers/net/wireless/ath/wcn36xx/main.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c index 1cddb78..fadacb3 100644 --- a/drivers/net/wireless/ath/wcn36xx/main.c +++ b/drivers/net/wireless/ath/wcn36xx/main.c @@ -1124,6 +1124,13 @@ 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; @@ -1146,6 +1153,10 @@ 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; -- 2.7.4