From patchwork Thu Oct 12 19:25:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13419706 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 0F5123B2B4 for ; Thu, 12 Oct 2023 19:30:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="ZKyBR9cU" Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FDDCCF for ; Thu, 12 Oct 2023 12:30:18 -0700 (PDT) Received: by mail-pf1-x434.google.com with SMTP id d2e1a72fcca58-692ada71d79so1144594b3a.1 for ; Thu, 12 Oct 2023 12:30:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1697139018; x=1697743818; 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=NbvzQqP0LAVibFSc2uogz4x5ZKRmyFttXMYHpoYS+M4=; b=ZKyBR9cUkEwA/LMbDou152prn3jqubQEGGjLUARcLLnm0F8vWYtVANBYVDiLdrH8kG wCV+DLkaWoxHy22+6i+Bb9rILNZ5hv1WD+JfwFf8IYmoRpWTjBvGEHIFFTCjYKxy7eaR BGLxcG6cYjXPbEmAW6PKG1gByySvPV2cmro6k= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697139018; x=1697743818; 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=NbvzQqP0LAVibFSc2uogz4x5ZKRmyFttXMYHpoYS+M4=; b=tRFW9nwOraPNzC0q0CHxsdooGRHTJMR122Jc2Vjwnd61/VRz6EE6DTlYdItwiUy/rU Bdjar44o66yrzuPRkIajFgOuhh5c8jeZjoYZ+tTr164NsI3kg5SznlqgbSRdgvxJ5pET p9xBW9TH/1luImnL/6sMZCpYF2Y1QSWvEMGeXByys3MrxLX/dspDNcK4ugmlS9XTui+C BaEct4FEPfh6RzB4zNUpMjDyWS0hUra9zXp5mqKvG9EHc1mqezfQgvhxlqx6GYQgdcBw UQt/dT1m2zzcb9JmwHiqbmdbBVSOJVyuhum4C9pPasz74ek5yH1dR6dsOMSSB8Tga/kN MWIA== X-Gm-Message-State: AOJu0YwHdKLlzXIfoJvBa0hEdL2Iemz4USpz04Cbluj3pT1/i3K2MrPj 2xSu8OwSL7AWnrqHpijiiQDdoQ== X-Google-Smtp-Source: AGHT+IHX+LAFkl+UTb4hMHk5hMbenBt98/XVUPofnKxCfpJ1RLXBg+q7crQtvdtlRe1yoANKkXPevg== X-Received: by 2002:a05:6a21:789c:b0:14b:8b82:867f with SMTP id bf28-20020a056a21789c00b0014b8b82867fmr26000299pzc.50.1697139017857; Thu, 12 Oct 2023 12:30:17 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:7c85:4a99:f03e:6f30]) by smtp.gmail.com with ESMTPSA id b3-20020a639303000000b0057c25885fcfsm2075720pge.10.2023.10.12.12.30.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Oct 2023 12:30:17 -0700 (PDT) From: Douglas Anderson To: Jakub Kicinski , Hayes Wang , "David S . Miller" Cc: Alan Stern , Simon Horman , Edward Hill , Laura Nao , linux-usb@vger.kernel.org, Grant Grundler , Douglas Anderson , =?utf-8?q?Bj=C3=B8rn_Mork?= , Eric Dumazet , Paolo Abeni , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v3 1/5] r8152: Increase USB control msg timeout to 5000ms as per spec Date: Thu, 12 Oct 2023 12:25:00 -0700 Message-ID: <20231012122458.v3.1.I6e4fb5ae61b4c6ab32058cb12228fd5bd32da676@changeid> X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog In-Reply-To: <20231012192552.3900360-1-dianders@chromium.org> References: <20231012192552.3900360-1-dianders@chromium.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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;