From: Bitterblue Smith rtl8821cerfe2@gmail.com
[ 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@mailbox.org Tested-by: Erhard F. erhard_f@mailbox.org 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@gmail.com Reviewed-by: Ping-Ke Shih pkshih@realtek.com Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://lore.kernel.org/r/03b099c1-c671-d252-36f4-57b70d721f9d@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c index c8b82c5810111..75d393b5dbe5e 100644 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c @@ -5552,9 +5552,6 @@ 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);
@@ -5587,10 +5584,9 @@ 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,