From patchwork Thu Oct 19 21:20:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13429867 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 8876D3DFF7 for ; Thu, 19 Oct 2023 21:22:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="MPcZ51HN" Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BCA110F1 for ; Thu, 19 Oct 2023 14:21:56 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id d9443c01a7336-1caa7597af9so890885ad.1 for ; Thu, 19 Oct 2023 14:21:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1697750515; x=1698355315; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=99XDTyUCvOUhQUp0MWN4ekbCgPLwBk+829H/gHSUoe4=; b=MPcZ51HNc62moeK+/HePn0XOKEHJX/127aI6KsxoMr0BIV9AkaT9ImsCYxCC0jAXUV 3ZznDtvUVFzDoSdxlMhQvO8fXUCOK2ccN762TnO8JMzZajWOF0IWh6JPZ1NuY1mqOEMo WobmXd56f4+WENYmSJfy7D/y8DA3xgWDEL21c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697750515; x=1698355315; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=99XDTyUCvOUhQUp0MWN4ekbCgPLwBk+829H/gHSUoe4=; b=EEvD7/KzgMBF7TFIGa3ioud2w4Hh8Dk1yYKQ/Ltt3FjArsNePzhxji9HZIkJi6p1mL b2jEtPMUCubpaFAJS7PkiIRqq6vsgliI0s02Dk/9L1acYmosZhGX2SffpTZhkq903fD3 YbMwMj2sQzseLpyFx9AjxjP0u2+nJph2L4vydOMiZgiYHAoFpG3LsLfH9vg3XqWAKRj+ WfINc6PyGl1PXOUfmmWINzZCbkIGzF9iA5uEEa821aZ4Pse3aSqxKfYHh+PHQAwC5h5z thzmzN/5JpQFmiVqWIUibLrn/EHfhcx0o0FGdmnfAoEhV+N/7mC0QdBnxHsDaPuOIm5Y iFng== X-Gm-Message-State: AOJu0Yzk4b1CWGltxmgNUNI0sD9OjKVwpSNPwIZBk8+hA9/ektR4SZAJ PqgSC1acMreF6xyESbYTGZBf7A== X-Google-Smtp-Source: AGHT+IGHsyaazfKztgV6shIemQ+jlC7THOn7sKDO8SWa/SgIufIDIoOEAm3zf/DhGhEpv0iSNhqHcw== X-Received: by 2002:a17:902:e204:b0:1c9:ccbc:4c98 with SMTP id u4-20020a170902e20400b001c9ccbc4c98mr75405plb.37.1697750515162; Thu, 19 Oct 2023 14:21:55 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:a6da:6f08:412:e04b]) by smtp.gmail.com with ESMTPSA id l2-20020a170902d34200b001bbdd44bbb6sm154100plk.136.2023.10.19.14.21.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Oct 2023 14:21:54 -0700 (PDT) From: Douglas Anderson To: Jakub Kicinski , Hayes Wang , "David S . Miller" Cc: Grant Grundler , Edward Hill , linux-usb@vger.kernel.org, Simon Horman , Laura Nao , Alan Stern , Douglas Anderson , =?utf-8?q?Bj=C3=B8rn_Mork?= , Eric Dumazet , Paolo Abeni , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v4 1/5] r8152: Increase USB control msg timeout to 5000ms as per spec Date: Thu, 19 Oct 2023 14:20:20 -0700 Message-ID: <20231019142019.v4.1.I6e4fb5ae61b4c6ab32058cb12228fd5bd32da676@changeid> X-Mailer: git-send-email 2.42.0.758.gaed0368e0e-goog In-Reply-To: <20231019212130.3146151-1-dianders@chromium.org> References: <20231019212130.3146151-1-dianders@chromium.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org According to the comment next to USB_CTRL_GET_TIMEOUT and USB_CTRL_SET_TIMEOUT, although sending/receiving control messages is usually quite fast, the spec allows them to take up to 5 seconds. Let's increase the timeout in the Realtek driver from 500ms to 5000ms (using the #defines) to account for this. This is not just a theoretical change. The need for the longer timeout was seen in testing. Specifically, if you drop a sc7180-trogdor based Chromebook into the kdb debugger and then "go" again after sitting in the debugger for a while, the next USB control message takes a long time. Out of ~40 tests the slowest USB control message was 4.5 seconds. While dropping into kdb is not exactly an end-user scenario, the above is similar to what could happen due to an temporary interrupt storm, what could happen if there was a host controller (HW or SW) issue, or what could happen if the Realtek device got into a confused state and needed time to recover. This change is fairly critical since the r8152 driver in Linux doesn't expect register reads/writes (which are backed by USB control messages) to fail. Fixes: ac718b69301c ("net/usb: new driver for RTL8152") Suggested-by: Hayes Wang Signed-off-by: Douglas Anderson --- (no changes since v1) drivers/net/usb/r8152.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 0c13d9950cd8..482957beae66 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -1212,7 +1212,7 @@ int get_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data) ret = usb_control_msg(tp->udev, tp->pipe_ctrl_in, RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, - value, index, tmp, size, 500); + value, index, tmp, size, USB_CTRL_GET_TIMEOUT); if (ret < 0) memset(data, 0xff, size); else @@ -1235,7 +1235,7 @@ int set_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data) ret = usb_control_msg(tp->udev, tp->pipe_ctrl_out, RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE, - value, index, tmp, size, 500); + value, index, tmp, size, USB_CTRL_SET_TIMEOUT); kfree(tmp); @@ -9494,7 +9494,8 @@ static u8 __rtl_get_hw_ver(struct usb_device *udev) ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, - PLA_TCR0, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500); + PLA_TCR0, MCU_TYPE_PLA, tmp, sizeof(*tmp), + USB_CTRL_GET_TIMEOUT); if (ret > 0) ocp_data = (__le32_to_cpu(*tmp) >> 16) & VERSION_MASK;