Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755192AbdC1JWq (ORCPT ); Tue, 28 Mar 2017 05:22:46 -0400 Received: from mail-it0-f52.google.com ([209.85.214.52]:35711 "EHLO mail-it0-f52.google.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755165AbdC1JWn (ORCPT ); Tue, 28 Mar 2017 05:22:43 -0400 MIME-Version: 1.0 In-Reply-To: References: From: Linus Walleij Date: Tue, 28 Mar 2017 11:14:49 +0200 Message-ID: Subject: Re: [PATCH v2 9/9] gpio: pci-idio-16: make use of raw_spinlock variants To: Julia Cartwright Cc: William Breathitt Gray , Alexandre Courbot , "linux-kernel@vger.kernel.org" , linux-rt-users@vger.kernel.org, "linux-gpio@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 732 Lines: 19 On Tue, Mar 21, 2017 at 11:43 PM, Julia Cartwright wrote: > The pci-idio-16 gpio driver currently implements an irq_chip for handling > interrupts; due to how irq_chip handling is done, it's necessary for the > irq_chip methods to be invoked from hardirq context, even on a a > real-time kernel. Because the spinlock_t type becomes a "sleeping" > spinlock w/ RT kernels, it is not suitable to be used with irq_chips. > > A quick audit of the operations under the lock reveal that they do only > minimal, bounded work, and are therefore safe to do under a raw spinlock. > > Signed-off-by: Julia Cartwright > --- > New patch as of v2 of series. Patch applied with William's ACK. Yours, Linus Walleij