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hwmon: (smsc47m1) Fix compiler warning 

Some configurations produce the following compiler warning:

drivers/hwmon/smsc47m1.c: In function 'sm_smsc47m1_init':
drivers/hwmon/smsc47m1.c:938: warning: 'address' may be used uninitialized in this function

While this is a false positive, it can easily be fixed by overloading the return
value from smsc47m1_find with both address and error return code (the address
is an unsigned short and thus never negative). This also reduces module size by
a few bytes (46 bytes for x86_64).

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
This commit is contained in:
Guenter Roeck 2012-03-28 08:55:12 -07:00 committed by Guenter Roeck
parent 776cdc11b3
commit 1d0045ee4a
1 changed files with 10 additions and 9 deletions
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19
drivers/hwmon/smsc47m1.c
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@ -491,10 +491,10 @@ static const struct attribute_group smsc47m1_group = {
.attrs = smsc47m1_attributes,
};
static int __init smsc47m1_find(unsigned short *addr,
struct smsc47m1_sio_data *sio_data)
static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
{
u8 val;
unsigned short addr;
superio_enter();
val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
@ -546,9 +546,9 @@ static int __init smsc47m1_find(unsigned short *addr,
}
superio_select();
*addr = (superio_inb(SUPERIO_REG_BASE) << 8)
addr = (superio_inb(SUPERIO_REG_BASE) << 8)
| superio_inb(SUPERIO_REG_BASE + 1);
if (*addr == 0) {
if (addr == 0) {
pr_info("Device address not set, will not use\n");
superio_exit();
return -ENODEV;
@ -565,7 +565,7 @@ static int __init smsc47m1_find(unsigned short *addr,
}
superio_exit();
return 0;
return addr;
}
/* Restore device to its initial state */
@ -938,13 +938,15 @@ static int __init sm_smsc47m1_init(void)
unsigned short address;
struct smsc47m1_sio_data sio_data;
if (smsc47m1_find(&address, &sio_data))
return -ENODEV;
err = smsc47m1_find(&sio_data);
if (err < 0)
return err;
address = err;
/* Sets global pdev as a side effect */
err = smsc47m1_device_add(address, &sio_data);
if (err)
goto exit;
return err;
err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
if (err)
@ -955,7 +957,6 @@ static int __init sm_smsc47m1_init(void)
exit_device:
platform_device_unregister(pdev);
smsc47m1_restore(&sio_data);
exit:
return err;
}