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Subject[PATCH v5 2/2] Use "request_muxed_region" in it87 hwmon drivers
Date
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@google.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


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