From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754769AbdBGNAm (ORCPT ); Tue, 7 Feb 2017 08:00:42 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:36214 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754687AbdBGNAj (ORCPT ); Tue, 7 Feb 2017 08:00:39 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Stein , Mika Westerberg , Linus Walleij Subject: [PATCH 4.9 08/66] pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler Date: Tue, 7 Feb 2017 13:58:42 +0100 Message-Id: <20170207124528.656894489@linuxfoundation.org> X-Mailer: git-send-email 2.11.1 In-Reply-To: <20170207124528.281881183@linuxfoundation.org> References: <20170207124528.281881183@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Stein commit cdca06e4e85974d8a3503ab15709dbbaf90d3dd1 upstream. According to VLI64 Intel Atom E3800 Specification Update (#329901) concurrent read accesses may result in returning 0xffffffff and write accesses may be dropped silently. To workaround all accesses must be protected by locks. Signed-off-by: Alexander Stein Acked-by: Mika Westerberg Signed-off-by: Linus Walleij Signed-off-by: Greg Kroah-Hartman --- drivers/pinctrl/intel/pinctrl-baytrail.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/pinctrl/intel/pinctrl-baytrail.c +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c @@ -1612,7 +1612,9 @@ static void byt_gpio_irq_handler(struct continue; } + raw_spin_lock(&vg->lock); pending = readl(reg); + raw_spin_unlock(&vg->lock); for_each_set_bit(pin, &pending, 32) { virq = irq_find_mapping(vg->chip.irqdomain, base + pin); generic_handle_irq(virq);