hwmon: (it87) 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. "superio_enter" will return an error
if call to "request_muxed_region" fails. Rest of the code change is to
ripple an error return from superio_enter to the top level.

Signed-off-by: Nat Gurumoorthy <natg@google.com>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 19 insertions, 12 deletions

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 316b64823f7b..bb6405b92007 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -77,15 +77,13 @@ static struct platform_device *pdev;
 #define DEVID   0x20    /* Register: Device ID */
 #define DEVREV  0x22    /* Register: Device Revision */
 
-static inline int
-superio_inb(int reg)
+static inline int superio_inb(int reg)
 {
         outb(reg, REG);
         return inb(VAL);
 }
 
-static inline void
-superio_outb(int reg, int val)
+static inline void superio_outb(int reg, int val)
 {
         outb(reg, REG);
         outb(val, VAL);
@@ -101,27 +99,32 @@ static int superio_inw(int reg)
         return val;
 }
 
-static inline void
-superio_select(int ldn)
+static inline void superio_select(int ldn)
 {
         outb(DEV, REG);
         outb(ldn, VAL);
 }
 
-static inline void
-superio_enter(void)
+static inline int superio_enter(void)
 {
+        /*
+         * Try to reserve REG and REG + 1 for exclusive access.
+         */
+        if (!request_muxed_region(REG, 2, DRVNAME))
+                return -EBUSY;
+
         outb(0x87, REG);
         outb(0x01, REG);
         outb(0x55, REG);
         outb(0x55, REG);
+        return 0;
 }
 
-static inline void
-superio_exit(void)
+static inline void superio_exit(void)
 {
         outb(0x02, REG);
         outb(0x02, VAL);
+        release_region(REG, 2);
 }
 
 /* Logical device 4 registers */
@@ -1542,11 +1545,15 @@ static const struct attribute_group it87_group_label = {
 static int __init it87_find(unsigned short *address,
         struct it87_sio_data *sio_data)
 {
-        int err = -ENODEV;
+        int err;
         u16 chip_type;
         const char *board_vendor, *board_name;
 
-        superio_enter();
+        err = superio_enter();
+        if (err)
+                return err;
+
+        err = -ENODEV;
         chip_type = force_id ? force_id : superio_inw(DEVID);
 
         switch (chip_type) {