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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 B94CEC4360F for ; Fri, 15 Feb 2019 02:15:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83AC521B68 for ; Fri, 15 Feb 2019 02:15:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550196926; bh=RMg5PuicqD6wLdCkFGFtYvqP3WPgHb7vQmrk2An4b3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BH8NmN5uD6sSKcnba0EprmRv0Ymlb3S4ILtYEQVXAz+ezsDAK/JAjw5QaSBC9UsiY y8wtzCaGOcw37AqXnmROmKDVjgYyvFGw22C23JfdhZdCiCyhJymWsBJxIAOgOTMFf9 PNF39D2RdLhMal7m9vonQQ7PNZFWCn3C68xviyxg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405689AbfBOCPZ (ORCPT ); Thu, 14 Feb 2019 21:15:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:55100 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391951AbfBOCPX (ORCPT ); Thu, 14 Feb 2019 21:15:23 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8E8DB206BA; Fri, 15 Feb 2019 02:15:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550196922; bh=RMg5PuicqD6wLdCkFGFtYvqP3WPgHb7vQmrk2An4b3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lh9RVBS7UsHw+2/vuZMSbZ3QcXDwZdB03m8k4neCGk9wYXvol+GLf+k7OS3KH4/0a E7D6QgXsh+3Ga2y/eDxaosjhxVZSsr44nlt20f2ofAAD9jirfoY4ZEy83uHnVQDriH aX59JlsSnORFO7Ji5dLKGtf32y30MUKHYBv4L2dc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zeng Tao , Felipe Balbi , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 05/20] usb: dwc3: gadget: Fix the uninitialized link_state when udc starts Date: Thu, 14 Feb 2019 21:14:56 -0500 Message-Id: <20190215021511.179333-5-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190215021511.179333-1-sashal@kernel.org> References: <20190215021511.179333-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zeng Tao [ 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 b6037a0ae829..557f08adf644 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1676,6 +1676,7 @@ static int dwc3_gadget_start(struct usb_gadget *g, /* 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