From patchwork Fri Aug 16 10:21:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neeraj Sanjay Kale X-Patchwork-Id: 13765884 Received: from inva021.nxp.com (inva021.nxp.com [92.121.34.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 44584170A1F; Fri, 16 Aug 2024 10:23:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=92.121.34.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723803817; cv=none; b=bq+BT3gxT5cuSu8tQDSQQDwYcXyC8hsw+4b07U2oELqzTVCytk63wGfSI4D2KBkCNRA8OZZKG77xrosFFUyBQsLXFhiNx1sTWp9RFxQxpH1WwciSg6dau6nSNfGZ4jGW49OY1R+nnDsyg5nUq933m7Xf+YfhVX2ogp6vMAuwOTs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723803817; c=relaxed/simple; bh=Y4ndJSjO4/q+jn8rndjn4vogLDaqvgYuUybvHzudgTA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=HOdYRiHMNx8365wAfGWdF1pqvWK7Bkepk4HRtwHSKeKoIi4Jv4mzfrkO9ZMd62XkZqIIxKWZ0ax1KliW+5YxykwmdOja26ytk2BKxuYkRQY9Pqt+FQ94joHsGJeLI0KCyyAw4oHssLWtr+DcrICpbMH5aJybvgaAuIOixvYtQgc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; arc=none smtp.client-ip=92.121.34.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 969482008FB; Fri, 16 Aug 2024 12:23:33 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 0BF9420069C; Fri, 16 Aug 2024 12:23:33 +0200 (CEST) Received: from pe-lt8779.in-pnq01.nxp.com (pe-lt8779.in-pnq01.nxp.com [10.17.104.141]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 5F4771800318; Fri, 16 Aug 2024 18:23:31 +0800 (+08) From: Neeraj Sanjay Kale To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, amitkumar.karwar@nxp.com, rohit.fule@nxp.com, neeraj.sanjaykale@nxp.com, sherry.sun@nxp.com, ziniu.wang_1@nxp.com, haibo.chen@nxp.com, LnxRevLi@nxp.com Subject: [PATCH v2] Bluetooth: btnxpuart: Fix random crash seen while removing driver Date: Fri, 16 Aug 2024 15:51:13 +0530 Message-Id: <20240816102113.286531-1-neeraj.sanjaykale@nxp.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP This fixes the random kernel crash seen while removing the driver, when running the load/unload test over multiple iterations. 1) modprobe btnxpuart 2) hciconfig hci0 reset 3) hciconfig (check hci0 interface up with valid BD address) 4) modprobe -r btnxpuart Repeat steps 1 to 4 The ps_wakeup() call in btnxpuart_close() schedules the psdata->work(), which gets scheduled after module is removed, causing a kernel crash. This hidden issue got highlighted after enabling Power Save by default in 4183a7be7700 (Bluetooth: btnxpuart: Enable Power Save feature on startup) The new ps_cleanup() deasserts UART break immediately while closing serdev device, cancels any scheduled ps_work and destroys the ps_lock mutex. [ 85.884604] Unable to handle kernel paging request at virtual address ffffd4a61638f258 [ 85.884624] Mem abort info: [ 85.884625] ESR = 0x0000000086000007 [ 85.884628] EC = 0x21: IABT (current EL), IL = 32 bits [ 85.884633] SET = 0, FnV = 0 [ 85.884636] EA = 0, S1PTW = 0 [ 85.884638] FSC = 0x07: level 3 translation fault [ 85.884642] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000041dd0000 [ 85.884646] [ffffd4a61638f258] pgd=1000000095fff003, p4d=1000000095fff003, pud=100000004823d003, pmd=100000004823e003, pte=0000000000000000 [ 85.884662] Internal error: Oops: 0000000086000007 [#1] PREEMPT SMP [ 85.890932] Modules linked in: algif_hash algif_skcipher af_alg overlay fsl_jr_uio caam_jr caamkeyblob_desc caamhash_desc caamalg_desc crypto_engine authenc libdes crct10dif_ce polyval_ce polyval_generic snd_soc_imx_spdif snd_soc_imx_card snd_soc_ak5558 snd_soc_ak4458 caam secvio error snd_soc_fsl_spdif snd_soc_fsl_micfil snd_soc_fsl_sai snd_soc_fsl_utils gpio_ir_recv rc_core fuse [last unloaded: btnxpuart(O)] [ 85.927297] CPU: 1 PID: 67 Comm: kworker/1:3 Tainted: G O 6.1.36+g937b1be4345a #1 [ 85.936176] Hardware name: FSL i.MX8MM EVK board (DT) [ 85.936182] Workqueue: events 0xffffd4a61638f380 [ 85.936198] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 85.952817] pc : 0xffffd4a61638f258 [ 85.952823] lr : 0xffffd4a61638f258 [ 85.952827] sp : ffff8000084fbd70 [ 85.952829] x29: ffff8000084fbd70 x28: 0000000000000000 x27: 0000000000000000 [ 85.963112] x26: ffffd4a69133f000 x25: ffff4bf1c8540990 x24: ffff4bf215b87305 [ 85.963119] x23: ffff4bf215b87300 x22: ffff4bf1c85409d0 x21: ffff4bf1c8540970 [ 85.977382] x20: 0000000000000000 x19: ffff4bf1c8540880 x18: 0000000000000000 [ 85.977391] x17: 0000000000000000 x16: 0000000000000133 x15: 0000ffffe2217090 [ 85.977399] x14: 0000000000000001 x13: 0000000000000133 x12: 0000000000000139 [ 85.977407] x11: 0000000000000001 x10: 0000000000000a60 x9 : ffff8000084fbc50 [ 85.977417] x8 : ffff4bf215b7d000 x7 : ffff4bf215b83b40 x6 : 00000000000003e8 [ 85.977424] x5 : 00000000410fd030 x4 : 0000000000000000 x3 : 0000000000000000 [ 85.977432] x2 : 0000000000000000 x1 : ffff4bf1c4265880 x0 : 0000000000000000 [ 85.977443] Call trace: [ 85.977446] 0xffffd4a61638f258 [ 85.977451] 0xffffd4a61638f3e8 [ 85.977455] process_one_work+0x1d4/0x330 [ 85.977464] worker_thread+0x6c/0x430 [ 85.977471] kthread+0x108/0x10c [ 85.977476] ret_from_fork+0x10/0x20 [ 85.977488] Code: bad PC value [ 85.977491] ---[ end trace 0000000000000000 ]--- Preset since v6.9.11 Fixes: 86d55f124b52 ("Bluetooth: btnxpuart: Deasset UART break before closing serdev device") Signed-off-by: Neeraj Sanjay Kale Reviewed-by: Paul Menzel --- v2: Add details to commit message (Paul Menzel) --- drivers/bluetooth/btnxpuart.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c index f75b24bd3045..4bac4a81249c 100644 --- a/drivers/bluetooth/btnxpuart.c +++ b/drivers/bluetooth/btnxpuart.c @@ -449,6 +449,23 @@ static bool ps_wakeup(struct btnxpuart_dev *nxpdev) return false; } +static void ps_cleanup(struct btnxpuart_dev *nxpdev) +{ + struct ps_data *psdata = &nxpdev->psdata; + u8 ps_state; + + mutex_lock(&psdata->ps_lock); + ps_state = psdata->ps_state; + mutex_unlock(&psdata->ps_lock); + + if (ps_state != PS_STATE_AWAKE) + ps_control(psdata->hdev, PS_STATE_AWAKE); + + ps_cancel_timer(nxpdev); + cancel_work_sync(&psdata->work); + mutex_destroy(&psdata->ps_lock); +} + static int send_ps_cmd(struct hci_dev *hdev, void *data) { struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev); @@ -1363,7 +1380,6 @@ static int btnxpuart_close(struct hci_dev *hdev) { struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev); - ps_wakeup(nxpdev); serdev_device_close(nxpdev->serdev); skb_queue_purge(&nxpdev->txq); if (!IS_ERR_OR_NULL(nxpdev->rx_skb)) { @@ -1516,8 +1532,8 @@ static void nxp_serdev_remove(struct serdev_device *serdev) nxpdev->new_baudrate = nxpdev->fw_init_baudrate; nxp_set_baudrate_cmd(hdev, NULL); } - ps_cancel_timer(nxpdev); } + ps_cleanup(nxpdev); hci_unregister_dev(hdev); hci_free_dev(hdev); }