From nobody Mon Feb 9 06:31:14 2026 Received: from out203-205-221-240.mail.qq.com (out203-205-221-240.mail.qq.com [203.205.221.240]) (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 511487D09C; Thu, 29 Feb 2024 12:21:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.205.221.240 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709209292; cv=none; b=nygQZAiRf+1bYbh+GMMLquRP7Xam6ZhExhwMdWfoO8iq00hwbcSkaHtUnmUOCsJIYQ6kAYJeGMQpZMIldXIOwETExn7b9+p3Vkiq1jmK9sdEaYwT+Mdvuf1pMqJHYMMEncUD7pHWfdaajTWgnWE+r4osAW5Ubu8Qi+trZtHYpAw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709209292; c=relaxed/simple; bh=MSR7Gohd9L3H1wQbofEpvc+047GL8Hkx47b8e8xjZoY=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=NzfkbKSTcn4iK5II6bLSb+H6k/fMmy7EvVqAgUVpiK3d4OaGml+/bGFCfxKREkq9wR6V2XMEOzeS1HdRKLJr90E2OlfcFZTu7/kjiCpRUTh2vUB1Mzxcs/G/oHaYL2OS85nL1F8yVvR74qKstnK+quLg/VquC1BfSN3zl6VXBYw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com; spf=pass smtp.mailfrom=qq.com; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b=zLuFe7ZB; arc=none smtp.client-ip=203.205.221.240 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qq.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b="zLuFe7ZB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201512; t=1709209285; bh=dU9WJsM0VvFTwAl60XiV2GQzCopZDxedDmkKAu/mywc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=zLuFe7ZBwRoc+faIla3ad/ExTAx0Rh69HtFTsevCtxonUZfXKzCraBpULdlD2ZnuM vufO9Zuu8u395UWgYv2KYqOLAQMUc4zXFndLxnxSwvqDenqoDCcCk2b6+161C+1qwP e58Bf2K2/QCi7uT+5IM6VwqPZeJFxWbCbUYpmSj4= Received: from pek-lxu-l1.wrs.com ([111.198.228.140]) by newxmesmtplogicsvrszb9-0.qq.com (NewEsmtp) with SMTP id 5563B03A; Thu, 29 Feb 2024 20:21:22 +0800 X-QQ-mid: xmsmtpt1709209282tqirugosv Message-ID: X-QQ-XMAILINFO: MtZ4zLDUQmWfqDyLt8mHh4sepj+IqaTuKdCoCZQQq7B6VdFKCOOR22OzPvhGd+ erMlmfzNiaYFwG6RnrohRlmnnXXJcg2/QGgS5PTEFW73iYyAlwn4wUYK5xTPOK8NVQl85ytkFfmv F2zOcs9pwq5GWnc63lkz6giUBIN8tcPGq3WRiV726ZWh49xWXT0CjNeyQHpUDLjep7cRxB8ll54o vvLJdZ1uHJN+8Ioc8+t7XYacScvMf6pJ8bCwdUlyhJREF3RHJfTC9MnB0YIMS3yALCR3NE2RAn8y QubRbWURu+/tFsCb7P/BigomPU8iJIbVZmsvW5818emUB9D9gyfLz14VyCfjX5zLV7cfj2wVqd9B n/QpIgGAxLXWr0789SU+wPPMmJ8Pip4GyYmN8dcENXFDa4Gn2vZRfpTZzj83ehUaUrF7QdeH6/so JLKConi+EZGAmDF4tiCAPR1eYdFLremb+U5Aa9Q6+hU3uwzMFNshcsriYhOWUp846YFkyck3SaHV MZhjwu0sL5xQJNUK3RGE5wdybGy8hRXZf4bceHCpU95lVTwi8b0+6vKgzU4pLfXPwK9TytZ+U9ap BvxEVlxKJFW6mD6j671tbXs1rRRgafNlQA/7rSDJOaESfAI4zmavVVOcFf4BXwCmDVADtHHe5Xuo DFgdB7C8UET45g+oe5xGr2CW7a4FiSJ9AXHbe/FphXDdIqUaY1Ju1gDEd1yEB1I0oEYuQHQyj7To h+nAalUaqbo3kt6iIX+rveWRprGGReBd0qJJ+BNiW+CrAi/WNIkT2QN7dLrIrg5WFkGaS6TEbyzs fp4HTLQ0SJx9YGhrKrbhVfnfCRzpei1Z2MOTNawRf/tuCKzWX1xIXUZUseZWdhtZmKhZJn9TheHB hqYXXjPpphy29mM3kkceIQCmI7j86WmoTgqlPjyiqo7KpIV30ja5g1J5aSeS9NWQ== X-QQ-XMRINFO: MSVp+SPm3vtS1Vd6Y4Mggwc= From: Edward Adam Davis To: syzbot+2622b51b35f91a00ea18@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, m.szyprowski@samsung.com, mchehab@kernel.org, syzkaller-bugs@googlegroups.com, tfiga@chromium.org Subject: [PATCH] media: fix task hung in vb2_video_unregister_device Date: Thu, 29 Feb 2024 20:21:22 +0800 X-OQ-MSGID: <20240229122122.978268-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <0000000000008faf0a06126a0ffb@google.com> References: <0000000000008faf0a06126a0ffb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" vb2_video_unregister_device() will get vb2q_lock, so usbtv_video_free() does not need vb2q_lock. Reported-and-tested-by: syzbot+2622b51b35f91a00ea18@syzkaller.appspotmail.c= om Signed-off-by: Edward Adam Davis --- drivers/media/usb/usbtv/usbtv-video.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbt= v/usbtv-video.c index 62a583040cd4..b55f432b44d4 100644 --- a/drivers/media/usb/usbtv/usbtv-video.c +++ b/drivers/media/usb/usbtv/usbtv-video.c @@ -963,7 +963,6 @@ int usbtv_video_init(struct usbtv *usbtv) =20 void usbtv_video_free(struct usbtv *usbtv) { - mutex_lock(&usbtv->vb2q_lock); mutex_lock(&usbtv->v4l2_lock); =20 usbtv_stop(usbtv); @@ -971,7 +970,6 @@ void usbtv_video_free(struct usbtv *usbtv) v4l2_device_disconnect(&usbtv->v4l2_dev); =20 mutex_unlock(&usbtv->v4l2_lock); - mutex_unlock(&usbtv->vb2q_lock); =20 v4l2_device_put(&usbtv->v4l2_dev); } --=20 2.43.0