From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1046379AbdDXFmf (ORCPT ); Mon, 24 Apr 2017 01:42:35 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:39786 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1046165AbdDXFmb (ORCPT ); Mon, 24 Apr 2017 01:42:31 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org CD8FF61245 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=weili@codeaurora.org From: Wei Li To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, vatsa@codeaurora.org, Wei Li Subject: [PATCH] driver-core: remove lock for platform devices during probe Date: Mon, 24 Apr 2017 13:42:16 +0800 Message-Id: <1493012536-9240-1-git-send-email-weili@codeaurora.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During driver probe procedure, lock on the parent of platform devices could be removed to make probe in parallel. Signed-off-by: Wei Li --- drivers/base/dd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index a1fbf55..e238fbc 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -25,6 +25,7 @@ #include #include #include +#include #include "base.h" #include "power/power.h" @@ -749,13 +750,14 @@ static int __driver_attach(struct device *dev, void *data) return ret; } /* ret > 0 means positive match */ - if (dev->parent) /* Needed for USB */ + if (dev->parent && + (dev->bus != &platform_bus_type)) /* Needed for USB */ device_lock(dev->parent); device_lock(dev); if (!dev->driver) driver_probe_device(drv, dev); device_unlock(dev); - if (dev->parent) + if (dev->parent && (dev->bus != &platform_bus_type)) device_unlock(dev->parent); return 0; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project