This is a note to let you know that I've just added the patch titled
wcn36xx: Fix packet drop on resume
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wcn36xx-fix-packet-drop-on-resume.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e07d82ba326a0bd56964da025ef1b13ff526b51f
Author: Loic Poulain <loic.poulain@xxxxxxxxxx>
Date: Mon Oct 25 10:28:16 2021 +0200
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@xxxxxxxxxx>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1635150496-19290-1-git-send-email-loic.poulain@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index 457fdf365b2d1..f98b44c257c61 100644
--- 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;
