This is a note to let you know that I've just added the patch titled
wifi: rtl8xxxu: Fix memory leaks with RTL8723BU, RTL8192EU
to the 6.1-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:
wifi-rtl8xxxu-fix-memory-leaks-with-rtl8723bu-rtl819.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4e168397eb0512cb3841eaf9a6dc37a1dc7ffb93
Author: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
Date: Thu Dec 22 13:48:04 2022 +0200
wifi: rtl8xxxu: Fix memory leaks with RTL8723BU, RTL8192EU
[ Upstream commit b39f662ce1648db0b9de32e6a849b098480793cb ]
The wifi + bluetooth combo chip RTL8723BU can leak memory (especially?)
when it's connected to a bluetooth audio device. The busy bluetooth
traffic generates lots of C2H (card to host) messages, which are not
freed correctly.
To fix this, move the dev_kfree_skb() call in rtl8xxxu_c2hcmd_callback()
inside the loop where skb_dequeue() is called.
The RTL8192EU leaks memory because the C2H messages are added to the
queue and left there forever. (This was fine in the past because it
probably wasn't sending any C2H messages until commit e542e66b7c2e
("wifi: rtl8xxxu: gen2: Turn on the rate control"). Since that commit
it sends a C2H message when the TX rate changes.)
To fix this, delete the check for rf_paths > 1 and the goto. Let the
function process the C2H messages from RTL8192EU like the ones from
the other chips.
Theoretically the RTL8188FU could also leak like RTL8723BU, but it
most likely doesn't send C2H messages frequently enough.
This change was tested with RTL8723BU by Erhard F. I tested it with
RTL8188FU and RTL8192EU.
Reported-by: Erhard F. <erhard_f@xxxxxxxxxxx>
Tested-by: Erhard F. <erhard_f@xxxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215197
Fixes: e542e66b7c2e ("rtl8xxxu: add bluetooth co-existence support for single antenna")
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
Reviewed-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/03b099c1-c671-d252-36f4-57b70d721f9d@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 8d91939dea8cf..a285f0dd9b9b1 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -5547,9 +5547,6 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work)
btcoex = &priv->bt_coex;
rarpt = &priv->ra_report;
- if (priv->rf_paths > 1)
- goto out;
-
while (!skb_queue_empty(&priv->c2hcmd_queue)) {
skb = skb_dequeue(&priv->c2hcmd_queue);
@@ -5601,10 +5598,9 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work)
default:
break;
}
- }
-out:
- dev_kfree_skb(skb);
+ dev_kfree_skb(skb);
+ }
}
static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv,
