From patchwork Tue Jun 16 20:37:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 11608607 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 871B760D for ; Tue, 16 Jun 2020 20:37:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B838208B3 for ; Tue, 16 Jun 2020 20:37:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="R5D8rBaJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726840AbgFPUhn (ORCPT ); Tue, 16 Jun 2020 16:37:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35200 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725896AbgFPUhm (ORCPT ); Tue, 16 Jun 2020 16:37:42 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 739D4C061755 for ; Tue, 16 Jun 2020 13:37:41 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id s88so2166527pjb.5 for ; Tue, 16 Jun 2020 13:37:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xjDHEijxA5jX/NCAw6/eQbUNUcsi5uFiyeIKic4MZ28=; b=R5D8rBaJGQqskgZLnAm4lfOrO2TTpKw1JUeusk2w0ksw2Mqg9gf4SEXqUB8NhgxF4M +COlgnE114HAwhXWlfOwUJXhLfcRH/JthVfWq/QNvj6AfcoiQvh5AOIGAxfU2GxjFELh c01s4x1Xth7X5Rly3rrCHqRQjtRPqXNQCnnvI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xjDHEijxA5jX/NCAw6/eQbUNUcsi5uFiyeIKic4MZ28=; b=kfU4fMbxKEXxSp4ZXdihnGvvOHP8kdgIOP1hDbmrVpK8Wbfrxm0qVSNkvaO7TVdS0T CAWREnY+AONfYx/N74YwRq1QEhoLd959RdWXigt0rkENMBy23P+4L1dZUTbtBuj7G4O6 WXkEEjjkVnmXS38Y/NSSv85YuobC8jWyXR7uYns0nbVTp8ZG8YeZFlqUpRXPn8utGcOX 8+xOBaW6qRLHUP8yAyt2vB+sgoRfHQA0N6axLQFUMV3BmS3DtIWoTCTyixRZ13TEifo5 Zdhh9hpQAFu3YE08whCpxs93+6hBFFOt3DWnvvZVewPwb62NptH6DqlSaWe0qqUmv4zY WvAw== X-Gm-Message-State: AOAM533YDckhM0OsFy4AdxM0/P3koocL5yrtbeUzglnz+JvyxK6Tq+N4 cByUiwDi0LZKKDak6TIaH8w2Kw== X-Google-Smtp-Source: ABdhPJxpFyy6tkXgIAY+58Fe1gDOxV5E6IqGluSe/o8T0/HOtLkWJiJJ1dP0HZ7PHtnA832kJeEd0Q== X-Received: by 2002:a17:902:bd0b:: with SMTP id p11mr3552194pls.91.1592339860776; Tue, 16 Jun 2020 13:37:40 -0700 (PDT) Received: from localhost ([2620:15c:202:1:4fff:7a6b:a335:8fde]) by smtp.gmail.com with ESMTPSA id z9sm3232116pjr.39.2020.06.16.13.37.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Jun 2020 13:37:40 -0700 (PDT) From: Matthias Kaehlcke To: Felipe Balbi , Greg Kroah-Hartman , Andy Gross Cc: linux-arm-msm@vger.kernel.org, Manu Gautam , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Sandeep Maheswaram , Doug Anderson , Stephen Boyd , Matthias Kaehlcke , Bjorn Andersson Subject: [PATCH] usb: dwc3: qcom: Make sure core device is fully initialized before it is used Date: Tue, 16 Jun 2020 13:37:37 -0700 Message-Id: <20200616133734.1.I1902d0d48e4f3d4c5b5f1a2008108a4cd3c5ddb5@changeid> X-Mailer: git-send-email 2.27.0.290.gba653c62da-goog MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org dwc3_qcom_of_register_core() uses of_platform_populate() to add the dwc3 core device. The driver core will try to probe the device, however this might fail (e.g. due to deferred probing) and of_platform_populate() would still return 0 if the device was successully added to the platform bus. Verify that the core device is actually bound to its driver before using it, defer probing of the dwc3_qcom device if the core device isn't ready (yet). Fixes: a4333c3a6ba9 ("usb: dwc3: Add Qualcomm DWC3 glue driver"). Signed-off-by: Matthias Kaehlcke Reviewed-by: Bjorn Andersson Reported-by: kernel test robot --- depends on: https://lore.kernel.org/patchwork/patch/1251661/ ("driver core:Export the symbol device_is_bound") drivers/usb/dwc3/dwc3-qcom.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c index 1dfd024cd06b..5a9036b050c6 100644 --- a/drivers/usb/dwc3/dwc3-qcom.c +++ b/drivers/usb/dwc3/dwc3-qcom.c @@ -537,6 +537,16 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev) return -ENODEV; } + /* + * A successful return from of_platform_populate() only guarantees that + * the core device was added to the platform bus, however it might not + * be bound to its driver (e.g. due to deferred probing). This driver + * requires the core device to be fully initialized, so defer probing + * if it isn't ready (yet). + */ + if (!device_is_bound(&qcom->dwc3->dev)) + return -EPROBE_DEFER; + return 0; }