From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,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 9DC52C43381 for ; Mon, 4 Mar 2019 08:39:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 70E1020823 for ; Mon, 4 Mar 2019 08:39:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551688772; bh=1y4ayOV0q3V0jBtsI2qzd7COkPHDMPnyw3NVR1WFN5w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HcdZSYYtV/AxrbDctc0nscLRN4utuesNtk9cv/o0sJ8vgYExzB2bgUirifhd5Ds1r rB4TzMGDZWCEgjL4YGXq+I/5o6xnMwlGmVKqo8Cnr/hjetxQiR2TCUm0OhyAeOSZGW tx6GsiNcuoeNFEtNARDKQlNjrCq+81uLzaEojmsY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727819AbfCDIja (ORCPT ); Mon, 4 Mar 2019 03:39:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:38756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728012AbfCDIdo (ORCPT ); Mon, 4 Mar 2019 03:33:44 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E2B2820836; Mon, 4 Mar 2019 08:33:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551688423; bh=1y4ayOV0q3V0jBtsI2qzd7COkPHDMPnyw3NVR1WFN5w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=beCDxFTr7655mNfo3C7VmZO/Q3RhVM7V8wFLjSISUS4DmKKMlp4ns1S9rc3ofRtRa 4N5v4Q2omZFv0oyJTDpQwM/YzBI8KZwdreLnBEDaf/AX9e4LzT2z2XSmGFwec/4TwA XarCt0aRb/qrBh9bgRbuBUDcXsa4FCX7dNlR1CmI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zeng Tao , Felipe Balbi , Sasha Levin Subject: [PATCH 4.20 13/88] usb: dwc3: gadget: Fix the uninitialized link_state when udc starts Date: Mon, 4 Mar 2019 09:21:56 +0100 Message-Id: <20190304081631.091905298@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190304081630.610632175@linuxfoundation.org> References: <20190304081630.610632175@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 88b1bb1f3b88e0bf20b05d543a53a5b99bd7ceb6 ] Currently the link_state is uninitialized and the default value is 0(U0) before the first time we start the udc, and after we start the udc then stop the udc, the link_state will be undefined. We may have the following warnings if we start the udc again with an undefined link_state: WARNING: CPU: 0 PID: 327 at drivers/usb/dwc3/gadget.c:294 dwc3_send_gadget_ep_cmd+0x304/0x308 dwc3 100e0000.hidwc3_0: wakeup failed --> -22 [...] Call Trace: [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0x84/0x98) [] (dump_stack) from [] (__warn+0xe8/0x100) [] (__warn) from [](warn_slowpath_fmt+0x38/0x48) [] (warn_slowpath_fmt) from [](dwc3_send_gadget_ep_cmd+0x304/0x308) [] (dwc3_send_gadget_ep_cmd) from [](dwc3_ep0_start_trans+0x48/0xf4) [] (dwc3_ep0_start_trans) from [](dwc3_ep0_out_start+0x64/0x80) [] (dwc3_ep0_out_start) from [](__dwc3_gadget_start+0x1e0/0x278) [] (__dwc3_gadget_start) from [](dwc3_gadget_start+0x88/0x10c) [] (dwc3_gadget_start) from [](udc_bind_to_driver+0x88/0xbc) [] (udc_bind_to_driver) from [](usb_gadget_probe_driver+0xf8/0x140) [] (usb_gadget_probe_driver) from [](gadget_dev_desc_UDC_store+0xac/0xc4 [libcomposite]) [] (gadget_dev_desc_UDC_store [libcomposite]) from[] (configfs_write_file+0xd4/0x160) [] (configfs_write_file) from [] (__vfs_write+0x1c/0x114) [] (__vfs_write) from [] (vfs_write+0xa4/0x168) [] (vfs_write) from [] (SyS_write+0x3c/0x90) [] (SyS_write) from [] (ret_fast_syscall+0x0/0x3c) Signed-off-by: Zeng Tao Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin --- drivers/usb/dwc3/gadget.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index a7f6255606443..bf1cb91ef494d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1873,6 +1873,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc) /* begin to receive SETUP packets */ dwc->ep0state = EP0_SETUP_PHASE; + dwc->link_state = DWC3_LINK_STATE_SS_DIS; dwc3_ep0_out_start(dwc); dwc3_gadget_enable_irq(dwc); -- 2.19.1