From: Steven Rostedt Date: Tue, 5 Apr 2022 14:02:00 +0000 (-0400) Subject: Bluetooth: hci_qca: Use del_timer_sync() before freeing X-Git-Tag: microblaze-v5.20~161^2~6^2~20 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=72ef98445aca568a81c2da050532500a8345ad3a;p=linux-2.6-microblaze.git Bluetooth: hci_qca: Use del_timer_sync() before freeing While looking at a crash report on a timer list being corrupted, which usually happens when a timer is freed while still active. This is commonly triggered by code calling del_timer() instead of del_timer_sync() just before freeing. One possible culprit is the hci_qca driver, which does exactly that. Eric mentioned that wake_retrans_timer could be rearmed via the work queue, so also move the destruction of the work queue before del_timer_sync(). Cc: Eric Dumazet Cc: stable@vger.kernel.org Fixes: 0ff252c1976da ("Bluetooth: hciuart: Add support QCA chipset for UART") Signed-off-by: Steven Rostedt (Google) Signed-off-by: Marcel Holtmann --- diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index f6e91fb432a3..eab34e24d944 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -696,9 +696,9 @@ static int qca_close(struct hci_uart *hu) skb_queue_purge(&qca->tx_wait_q); skb_queue_purge(&qca->txq); skb_queue_purge(&qca->rx_memdump_q); - del_timer(&qca->tx_idle_timer); - del_timer(&qca->wake_retrans_timer); destroy_workqueue(qca->workqueue); + del_timer_sync(&qca->tx_idle_timer); + del_timer_sync(&qca->wake_retrans_timer); qca->hu = NULL; kfree_skb(qca->rx_skb);