From: Marcel Ziswiler marcel.ziswiler@toradex.com

Fix scheduling while atomic BUG in btnxpuart_close(), properly purge the transmit queue and free the receive skb.

[ 10.973809] BUG: scheduling while atomic: kworker/u9:0/80/0x00000002 ... [ 10.980740] CPU: 3 PID: 80 Comm: kworker/u9:0 Not tainted 6.8.0-rc7-0.0.0-devel-00005-g61fdfceacf09 #1 [ 10.980751] Hardware name: Toradex Verdin AM62 WB on Dahlia Board (DT) [ 10.980760] Workqueue: hci0 hci_power_off [bluetooth] [ 10.981169] Call trace: ... [ 10.981363] uart_update_mctrl+0x58/0x78 [ 10.981373] uart_dtr_rts+0x104/0x114 [ 10.981381] tty_port_shutdown+0xd4/0xdc [ 10.981396] tty_port_close+0x40/0xbc [ 10.981407] uart_close+0x34/0x9c [ 10.981414] ttyport_close+0x50/0x94 [ 10.981430] serdev_device_close+0x40/0x50 [ 10.981442] btnxpuart_close+0x24/0x98 [btnxpuart] [ 10.981469] hci_dev_close_sync+0x2d8/0x718 [bluetooth] [ 10.981728] hci_dev_do_close+0x2c/0x70 [bluetooth] [ 10.981862] hci_power_off+0x20/0x64 [bluetooth]

Fixes: 689ca16e5232 ("Bluetooth: NXP: Add protocol support for NXP Bluetooth chipsets") Cc: stable@vger.kernel.org Signed-off-by: Marcel Ziswiler marcel.ziswiler@toradex.com Reviewed-by: Neeraj Sanjay Kale neeraj.sanjaykale@nxp.com [ fd: reword commit message ] Signed-off-by: Francesco Dolcini francesco.dolcini@toradex.com --- v2: - reword commit message - added rb neeraj v1: https://lore.kernel.org/all/20231018145540.34014-2-marcel@ziswiler.com/ --- drivers/bluetooth/btnxpuart.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c index 55b6e3dcd4ec..0b93c2ff29e4 100644 --- a/drivers/bluetooth/btnxpuart.c +++ b/drivers/bluetooth/btnxpuart.c @@ -1252,6 +1252,9 @@ static int btnxpuart_close(struct hci_dev *hdev)

ps_wakeup(nxpdev); serdev_device_close(nxpdev->serdev); + skb_queue_purge(&nxpdev->txq); + kfree_skb(nxpdev->rx_skb); + nxpdev->rx_skb = NULL; clear_bit(BTNXPUART_SERDEV_OPEN, &nxpdev->tx_state); return 0; }