-----Original Message----- From: Luke Wang ziniu.wang_1@nxp.com Sent: 2024年5月17日 19:16 To: marcel@holtmann.org; luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org; linux-kernel@vger.kernel.org; Amitkumar Karwar amitkumar.karwar@nxp.com; Rohit Fule rohit.fule@nxp.com; Neeraj Sanjay Kale neeraj.sanjaykale@nxp.com; Sherry Sun sherry.sun@nxp.com; Bough Chen haibo.chen@nxp.com; Jun Li jun.li@nxp.com; Guillaume Legoupil guillaume.legoupil@nxp.com; Salim Chebbo salim.chebbo@nxp.com; imx@lists.linux.dev Subject: [PATCH] Bluetooth: btnxpuart: Shutdown timer and prevent rearming when driver unloading

From: Luke Wang ziniu.wang_1@nxp.com

When unload the btnxpuart driver, its associated timer will be deleted. If the timer happens to be modified at this moment, it leads to the kernel call this timer even after the driver unloaded, resulting in kernel panic. Use timer_shutdown_sync() instead of del_timer_sync() to prevent rearming.

panic log: Internal error: Oops: 0000000086000007 [#1] PREEMPT SMP Modules linked in: algif_hash algif_skcipher af_alg moal(O) mlan(O) crct10dif_ce polyval_ce polyval_generic snd_soc_imx_card snd_soc_fsl_asoc_card snd_soc_imx_audmux mxc_jpeg_encdec v4l2_jpeg snd_soc_wm8962 snd_soc_fsl_micfil snd_soc_fsl_sai flexcan snd_soc_fsl_utils ap130x rpmsg_ctrl imx_pcm_dma can_dev rpmsg_char pwm_fan fuse [last unloaded: btnxpuart] CPU: 5 PID: 723 Comm: memtester Tainted: G O 6.6.23-lts-next-06207-g4aef2658ac28 #1 Hardware name: NXP i.MX95 19X19 board (DT) pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0xffff80007a2cf464 lr : call_timer_fn.isra.0+0x24/0x80 ... Call trace: 0xffff80007a2cf464 __run_timers+0x234/0x280 run_timer_softirq+0x20/0x40 __do_softirq+0x100/0x26c ____do_softirq+0x10/0x1c call_on_irq_stack+0x24/0x4c do_softirq_own_stack+0x1c/0x2c irq_exit_rcu+0xc0/0xdc el0_interrupt+0x54/0xd8 __el0_irq_handler_common+0x18/0x24 el0t_64_irq_handler+0x10/0x1c el0t_64_irq+0x190/0x194 Code: ???????? ???????? ???????? ???????? (????????) ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Oops: Fatal exception in interrupt SMP: stopping secondary CPUs Kernel Offset: disabled CPU features: 0x0,c0000000,40028143,1000721b Memory Limit: none ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]---

Hi all,

This patch is already accepted, but I notice it lack fix tag, can anyone help add the following fix tag? Fixes: 689ca16e5232 ("Bluetooth: NXP: Add protocol support for NXP Bluetooth chipsets") Cc: stable@vger.kernel.org

This patch should also put into stable tree. I add the stable tree mail list here.

Best Regards Haibo Chen

Signed-off-by: Luke Wang ziniu.wang_1@nxp.com

drivers/bluetooth/btnxpuart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c index 7f88b6f52f26..77f974a5251b 100644 --- a/drivers/bluetooth/btnxpuart.c +++ b/drivers/bluetooth/btnxpuart.c @@ -328,7 +328,7 @@ static void ps_cancel_timer(struct btnxpuart_dev *nxpdev) struct ps_data *psdata = &nxpdev->psdata;

flush_work(&psdata->work);

• del_timer_sync(&psdata->ps_timer);

• timer_shutdown_sync(&psdata->ps_timer);

}

static void ps_control(struct hci_dev *hdev, u8 ps_state)

2.34.1