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authorGuenter Roeck <linux@roeck-us.net>2016-08-03 22:07:18 -0700
committerGuenter Roeck <linux@roeck-us.net>2016-09-08 21:34:16 -0700
commitfc72af3ad43512bdea27cbd98f7acdb1e0354c2e (patch)
tree56d84922f1f300bed863b2c23be7643cc1e483fa /drivers/hwmon/nct6775.c
parentf9f7bb3a0efafb662a4c639bc62df1df2b7321f9 (diff)
downloadlinux-fc72af3ad43512bdea27cbd98f7acdb1e0354c2e.tar.bz2
hwmon: (nct6775) Do not accept force_id unless chip is found
Since commit 698a7c24a544 ("hwmon: (nct6775) Support two SuperIO chips in the same system"), the driver supports two Super-IO chips. This has the undesirable side effect that force_id always detects a second chip at address 0xfff8, even if no chip exists at that address. nct6775: Found NCT6793D or compatible chip at 0x4e:0xfff8 If no chip at all is found at a given SIO address, it does not make sense to instantiate it. Limit force_id to only work if some chip is found, that is if the chip ID returns a value other than 0xffff. Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/nct6775.c')
-rw-r--r--drivers/hwmon/nct6775.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index d087a8e00cf5..7859a30ce31e 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -4232,11 +4232,11 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
if (err)
return err;
- if (force_id)
+ val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) |
+ superio_inb(sioaddr, SIO_REG_DEVID + 1);
+ if (force_id && val != 0xffff)
val = force_id;
- else
- val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8)
- | superio_inb(sioaddr, SIO_REG_DEVID + 1);
+
switch (val & SIO_ID_MASK) {
case SIO_NCT6106_ID:
sio_data->kind = nct6106;