From patchwork Thu May 22 08:09:53 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 892116 Received: from mail.zeus03.de (zeus03.de [194.117.254.33]) (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 930EB261575 for ; Thu, 22 May 2025 08:10:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747901416; cv=none; b=fiX1n2XL+ADmha/Z/GXg67+ANP8An3+aLxkOnyLTG9L0duc7vpsryTpypEVS0zMHWQXfDt+8MsUWzpZEekVQA/1LmFO6n6lOxn0O+JWWoZ6oy02+St0BYUXJYqd1copHOSzXdsgtUnnqMMcRgkqyp77gTuLWkGibYs1AYpXTMRw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747901416; c=relaxed/simple; bh=eGFhm/Jw3pAMKbmqE6JuGBCVDI9dUGBFrZk3NomwTo0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=d+X8zee7e8XySvH3+f04x5jAvFqJY5gqfKyTN6Lqo1aE9oYxN41wdqs8xUBc0Xk/GPM6fveh3/UVm1BdEyowcRZFUwQAjopiM/x5fU3FiT8TlFF74ikCnbny5y4t7o5mSxoHmOHg1tMz3kJJdtxeBsrbUW9eygF3d8IZ1LlY/Ck= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=hpt/gpJ1; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="hpt/gpJ1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; s=k1; bh=coQlwEuT9v0sos BSpyej7UYSYIaMjXYkHcmZpyJCmwM=; b=hpt/gpJ1fWRq8hY9q+MFxHUDIxxJT+ 1jn5rPW72MqJf481FKa3wd/6kxXbhIZdhadZL57kOEMh45cfM3HsmiGowrFrDWAo vstrGnrxPg7nlpV5Ww+0n7cb+bI0qUUX5/WfjljgPFGFWJEeBWPoRgpjlN8C57oJ ighL8/I0mfUcRpfVJmnhl7S9yLh0daS2aSDyk3BFEsSGr7t8J+7MDnaxQ7iEq1t8 Xv2+znKhZcPAXMaqH5pbynQh5zJouJ9ssOQGbBElMxGWQOJuVGMo4LPU4FTR4BBe xpF6cLgtLxpuqWVPZ5mvWTyEh5O3PxdoaY53jngyxzpReVpyd4/krcNw== Received: (qmail 3566324 invoked from network); 22 May 2025 10:10:12 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 22 May 2025 10:10:12 +0200 X-UD-Smtp-Session: l3s3148p1@H6LIArU1WrYgAwDPXwj7ADHm2wGe7qss From: Wolfram Sang To: linux-i2c@vger.kernel.org Cc: Alan Stern , Nikita Zhandarovich , Wolfram Sang , Hans Verkuil , linux-media@vger.kernel.org, Mauro Carvalho Chehab Subject: [PATCH v2 0/2] media: usb: hdpvr: make use of quirk flags from I2C core Date: Thu, 22 May 2025 10:09:53 +0200 Message-ID: <20250522080953.27323-4-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.47.2 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We found a pattern that could create USB protocol violations for devices which embed an I2C bus and use I2C message lengths directly. Patch 1 fixes the bug for this driver by using a quirk flag. Patch 2 is a cleanup to remove a pattern in the driver which can also be handled with a quirk flag. Changes since v1: - removed now superfluous label in patch 2 Wolfram Sang (2): media: usb: hdpvr: disable zero-length read messages media: usb: hdpvr: use I2C core to handle only supported messages drivers/media/usb/hdpvr/hdpvr-i2c.c | 30 ++++++++--------------------- 1 file changed, 8 insertions(+), 22 deletions(-)