From patchwork Wed Mar 31 08:25:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chunfeng Yun X-Patchwork-Id: 12174717 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B02EC433DB for ; Wed, 31 Mar 2021 08:26:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2AE5619BC for ; Wed, 31 Mar 2021 08:26:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232951AbhCaI0U (ORCPT ); Wed, 31 Mar 2021 04:26:20 -0400 Received: from mailgw02.mediatek.com ([1.203.163.81]:8416 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S232406AbhCaIZw (ORCPT ); Wed, 31 Mar 2021 04:25:52 -0400 X-UUID: d7c51d1593e244d6964a671c36a08903-20210331 X-UUID: d7c51d1593e244d6964a671c36a08903-20210331 Received: from mtkcas36.mediatek.inc [(172.27.4.253)] by mailgw02.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1993034478; Wed, 31 Mar 2021 16:25:49 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 31 Mar 2021 16:25:46 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 31 Mar 2021 16:25:45 +0800 From: Chunfeng Yun To: Mathias Nyman , Greg Kroah-Hartman CC: Chunfeng Yun , Matthias Brugger , , , , Subject: [PATCH next 2/2] usb: xhci-mtk: fix oops when unbind driver Date: Wed, 31 Mar 2021 16:25:42 +0800 Message-ID: <1617179142-2681-2-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1617179142-2681-1-git-send-email-chunfeng.yun@mediatek.com> References: <1617179142-2681-1-git-send-email-chunfeng.yun@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: 614E4DE8A8471C2F373F0B87E228EECE78C7633A0599EF5262D0A24C1DDFC49F2000:8 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The oops happens when unbind driver through sysfs as following, because xhci_mtk_drop_ep() try to drop the endpoint of root hub which is not added by xhci_add_endpoint() and the virtual device is not allocated, in fact also needn't drop it, so should skip it. Call trace: xhci_mtk_drop_ep+0x1b8/0x298 usb_hcd_alloc_bandwidth+0x1d8/0x380 usb_disable_device_endpoints+0x8c/0xe0 usb_disable_device+0x128/0x168 usb_disconnect+0xbc/0x2c8 usb_remove_hcd+0xd8/0x210 xhci_mtk_remove+0x98/0x108 platform_remove+0x28/0x60 device_release_driver_internal+0x110/0x1e8 device_driver_detach+0x18/0x28 unbind_store+0xd4/0x108 drv_attr_store+0x24/0x38 Fixes: 14295a150050 ("usb: xhci-mtk: support to build xhci-mtk-hcd.ko") Reported-by: Eddie Hung Signed-off-by: Chunfeng Yun --- drivers/usb/host/xhci-mtk-sch.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c index 7ac76ae28998..8b90da5a6ed1 100644 --- a/drivers/usb/host/xhci-mtk-sch.c +++ b/drivers/usb/host/xhci-mtk-sch.c @@ -872,6 +872,8 @@ int xhci_mtk_drop_ep(struct usb_hcd *hcd, struct usb_device *udev, if (ret) return ret; - drop_ep_quirk(hcd, udev, ep); + if (ep->hcpriv) + drop_ep_quirk(hcd, udev, ep); + return 0; }