From patchwork Fri Dec 1 18:29:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 750008 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="NAm7TJYY" Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48B35133 for ; Fri, 1 Dec 2023 10:31:35 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id d2e1a72fcca58-6cdce15f0a3so2726116b3a.1 for ; Fri, 01 Dec 2023 10:31:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1701455494; x=1702060294; 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=4QGkTsdRERlNpczcwqSp2Og8v+XNs9gRL2qzJvnknds=; b=NAm7TJYYWKXNyXJQqhfgCjmvkRz0pVGCxouKfwO38mMJeiJ23rVzMICF/GVfMZ8ppf XDm6mJRBLudjMjQjlp47m2wVOs4IifZCBN/9iMaEIbDOoAiAPXb3AFkjVjvVTzWBlTiZ GkP5lpvIVvdufNP1MS3ttUlFaQMJJJEgB4Q1g= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455494; x=1702060294; 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=4QGkTsdRERlNpczcwqSp2Og8v+XNs9gRL2qzJvnknds=; b=C8AqXXZHHj9Zpp2aoEPrc6eielI5qNqONpNmwLQVTYrycQ16gqDMsvu7qsyZvtb4We Pgw6vWCLdZ0648lczbf+Mtq+obWWZ8HUSFD8weYbSfq2MALMJtgSokj6EYwvAIAxr6y/ POHX9+KICqbvEcmXkmGIvvNsI7xzHfB985MR1Ab1BzG92OkceYKorG+K8NvBhM6naP07 UEGSkj+tZ5irW5Ad+YkWdH+QXUVrcYJL2GijOANtJy//1psEsz/a0Wu6+wyV1e/64tb2 dGOvfbPJZqUpnXRhvTh7EY/Gi7OK4sfDJVxL54m/L7ZNVc0wyzF82OR/PIl+kWyQNLAL LGFA== X-Gm-Message-State: AOJu0YwxtkISfOJkM4xiYWWLZOE5Q4bO2jkYUxbQw2490+vc9IcBNZzm QbzwIADFEoO26PCU9tklAZ7qSVEmD+UH4wTzmwCQzeE6 X-Google-Smtp-Source: AGHT+IEVreiCKxTXFQEfBUwM2+9H3I4ehz8qYButpoJ4w50/BJH9JRBwy33v+a0gi/YRn62yOPKwgg== X-Received: by 2002:a05:6a00:430e:b0:6cd:fe6e:ac9b with SMTP id cb14-20020a056a00430e00b006cdfe6eac9bmr3530436pfb.0.1701455494239; Fri, 01 Dec 2023 10:31:34 -0800 (PST) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:11eb:92ac:94e:c791]) by smtp.gmail.com with ESMTPSA id g11-20020a056a00078b00b006cdda10bdafsm3306926pfu.183.2023.12.01.10.31.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:31:33 -0800 (PST) From: Douglas Anderson To: linux-usb@vger.kernel.org, Greg Kroah-Hartman , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Grant Grundler , Hayes Wang , Simon Horman , =?utf-8?q?Bj=C3=B8rn_Mork?= , netdev@vger.kernel.org, Brian Geffon , Alan Stern , Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH net v2 3/3] r8152: Choose our USB config with choose_configuration() rather than probe() Date: Fri, 1 Dec 2023 10:29:52 -0800 Message-ID: <20231201102946.v2.3.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid> X-Mailer: git-send-email 2.43.0.rc2.451.g8631bc7472-goog In-Reply-To: <20231201183113.343256-1-dianders@chromium.org> References: <20231201183113.343256-1-dianders@chromium.org> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 If you deauthorize the r8152 device (by writing 0 to the "authorized" field in sysfs) and then reauthorize it (by writing a 1) then it no longer works. This is because when you do the above we lose the special configuration that we set in rtl8152_cfgselector_probe(). Deauthorizing causes the config to be set to -1 and then reauthorizing runs the default logic for choosing the best config. I made an attempt to fix it so that the config is kept across deauthorizing / reauthorizing [1] but it was a bit ugly. Let's instead use the new USB core feature to override choose_configuration(). This patch relies upon the patches ("usb: core: Don't force USB generic_subclass drivers to define probe()") and ("usb: core: Allow subclassed USB drivers to override usb_choose_configuration()") [1] https://lore.kernel.org/r/20231130154337.1.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid Fixes: ec51fbd1b8a2 ("r8152: add USB device driver for config selection") Suggested-by: Alan Stern Signed-off-by: Douglas Anderson Acked-by: Jakub Kicinski --- Changes in v2: - ("Choose our USB config with choose_configuration()...) new for v2. drivers/net/usb/r8152.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 2c5c1e91ded6..0da723d11326 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -10053,7 +10053,7 @@ static struct usb_driver rtl8152_driver = { .disable_hub_initiated_lpm = 1, }; -static int rtl8152_cfgselector_probe(struct usb_device *udev) +static int rtl8152_cfgselector_choose_configuration(struct usb_device *udev) { struct usb_host_config *c; int i, num_configs; @@ -10080,19 +10080,13 @@ static int rtl8152_cfgselector_probe(struct usb_device *udev) if (i == num_configs) return -ENODEV; - if (usb_set_configuration(udev, c->desc.bConfigurationValue)) { - dev_err(&udev->dev, "Failed to set configuration %d\n", - c->desc.bConfigurationValue); - return -ENODEV; - } - - return 0; + return c->desc.bConfigurationValue; } static struct usb_device_driver rtl8152_cfgselector_driver = { - .name = MODULENAME "-cfgselector", - .probe = rtl8152_cfgselector_probe, - .id_table = rtl8152_table, + .name = MODULENAME "-cfgselector", + .choose_configuration = rtl8152_cfgselector_choose_configuration, + .id_table = rtl8152_table, .generic_subclass = 1, .supports_autosuspend = 1, };