From patchwork Fri Mar 15 01:58:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: yuan linyu X-Patchwork-Id: 780735 Received: from mta22.hihonor.com (mta22.hihonor.com [81.70.192.198]) (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 8BA024C91; Fri, 15 Mar 2024 01:58:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=81.70.192.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710467941; cv=none; b=F24sG9bc9C5wSe7ckZOkIqqGlDQL9TsK+tOuQE0WJFg1cCeHohMqksqf61JAXGWiXwdqHH85SRufw11CYMl3kMjSJt21y2FphliU4qJmLoXXRd7gDtFWD/4Z0RhNGXfiljfHcsuw3bV3kUqZlQtLmD08OEq0owB9WRsGqIVzZgY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710467941; c=relaxed/simple; bh=E+kVg+u+0gUmQN7fnsiMnl7B7ytJ+CvjexhkgnNwF/k=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=UVvdu73XMcG6N9HDbAxsCXS6C+7zmeNd4oCPG91OvGUne5B5ZRiJAp3PFkn/904ohLULAztJpqKGZNf7SxmMgweyuRYYbd6JL4Y+qUYUUJqohdL8kXPFVPi4TXCLCIoxWwhIMxjMCBzzuzoDqLOE5T98aKcrfIDu4AryKYKSGG0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hihonor.com; spf=pass smtp.mailfrom=hihonor.com; arc=none smtp.client-ip=81.70.192.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hihonor.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hihonor.com Received: from w001.hihonor.com (unknown [10.68.25.235]) by mta22.hihonor.com (SkyGuard) with ESMTPS id 4TwnSN3Mq2zYvRnD; Fri, 15 Mar 2024 09:57:24 +0800 (CST) Received: from w025.hihonor.com (10.68.28.69) by w001.hihonor.com (10.68.25.235) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.25; Fri, 15 Mar 2024 09:58:57 +0800 Received: from localhost.localdomain (10.144.17.252) by w025.hihonor.com (10.68.28.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.25; Fri, 15 Mar 2024 09:58:56 +0800 From: yuan linyu To: Alan Stern , Greg Kroah-Hartman CC: , yuan linyu , Subject: [PATCH] usb: udc: remove warning when queue disabled ep Date: Fri, 15 Mar 2024 09:58:54 +0800 Message-ID: <20240315015854.2715357-1-yuanlinyu@hihonor.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: w003.hihonor.com (10.68.17.88) To w025.hihonor.com (10.68.28.69) It is possible trigger below warning message from mass storage function, WARNING: CPU: 6 PID: 3839 at drivers/usb/gadget/udc/core.c:294 usb_ep_queue+0x7c/0x104 pc : usb_ep_queue+0x7c/0x104 lr : fsg_main_thread+0x494/0x1b3c Root cause is mass storage function try to queue request from main thread, but other thread may already disable ep when function disable. As there is no function failure in the driver, in order to avoid effort to fix warning, change WARN_ON_ONCE() in usb_ep_queue() to pr_debug(). Suggested-by: Alan Stern Cc: Signed-off-by: yuan linyu --- v3: add more debug info, remove two line commit description v2: change WARN_ON_ONCE() in usb_ep_queue() to pr_debug() https://lore.kernel.org/linux-usb/20240315013019.2711135-1-yuanlinyu@hihonor.com/ v1: https://lore.kernel.org/linux-usb/20240314065949.2627778-1-yuanlinyu@hihonor.com/ drivers/usb/gadget/udc/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 9d4150124fdb..b3a9d18a8dcd 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -292,7 +292,9 @@ int usb_ep_queue(struct usb_ep *ep, { int ret = 0; - if (WARN_ON_ONCE(!ep->enabled && ep->address)) { + if (!ep->enabled && ep->address) { + pr_debug("USB gadget: queue request to disabled ep 0x%x (%s)\n", + ep->address, ep->name); ret = -ESHUTDOWN; goto out; }