Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932428Ab1DLUux (ORCPT ); Tue, 12 Apr 2011 16:50:53 -0400 Received: from smtp-out.google.com ([216.239.44.51]:57005 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932144Ab1DLUuw (ORCPT ); Tue, 12 Apr 2011 16:50:52 -0400 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=nhjZULDUhMAvDkgmraH6XbNuqlA6MmRabxaUjgekBRecVJb9mtO6Ctm3yCMivntVG C3gkFEq4sEWFSBaSXX5bQ== From: Nat Gurumoorthy To: Jean Delvare , Guenter Roeck , Wim Van Sebroeck Cc: Mike Waychison , lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, Nat Gurumoorthy Subject: [PATCH v5 2/2] Use "request_muxed_region" in it87 hwmon drivers Date: Tue, 12 Apr 2011 13:50:18 -0700 Message-Id: <1302641418-30304-1-git-send-email-natg@google.com> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1302641290-30212-1-git-send-email-natg@google.com> References: <1302641290-30212-1-git-send-email-natg@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1094 Lines: 40 02 - Chages to hwmon it87 driver to use "request_muxed_region" Serialize access to the hardware by using "request_muxed_region" macro defined by Alan Cox. Call to this macro will hold off the requestor if the resource is currently busy. Signed-off-by: Nat Gurumoorthy --- diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 316b648..3945569 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -111,6 +111,11 @@ superio_select(int ldn) static inline void superio_enter(void) { + /* + * Reserve REG and REG + 1 for exclusive access. + */ + (void) request_muxed_region(REG, 2, DRVNAME); + outb(0x87, REG); outb(0x01, REG); outb(0x55, REG); @@ -122,6 +127,7 @@ superio_exit(void) { outb(0x02, REG); outb(0x02, VAL); + release_region(REG, 2); } /* Logical device 4 registers */ -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/