linux-kernel - [PATCH v5 2/2] Use "request_muxed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1302641418-30304-1-git-send-email-natg@google.com>
Date:	Tue, 12 Apr 2011 13:50:18 -0700
From:	Nat Gurumoorthy <natg@...gle.com>
To:	Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Wim Van Sebroeck <wim@...ana.be>
Cc:	Mike Waychison <mikew@...gle.com>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	Nat Gurumoorthy <natg@...gle.com>
Subject: [PATCH v5 2/2] Use "request_muxed_region" in it87 hwmon drivers

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 <natg@...gle.com>
---

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@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/