From 7ad6307ad6968ce25cecf209d4822d4c722be030 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 7 Mar 2012 03:58:55 -0800 Subject: [PATCH] hwmon: (zl6100) Maintain delay parameter in driver instance data A global delay parameter has the side effect of being overwritten with 0 if a single ZL2004 or ZL6105 is instantiated. If other chips supported by the same driver are in the system, this will result in access errors for those chips. To solve the problem, keep a per-instance copy of the delay parameter, and do not change the original parameter. Signed-off-by: Guenter Roeck Cc: stable@vger.kernel.org # 3.1+ Acked-by: Jean Delvare --- drivers/hwmon/pmbus/zl6100.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c index 48c7b4a716a..880b90cf4d3 100644 --- a/drivers/hwmon/pmbus/zl6100.c +++ b/drivers/hwmon/pmbus/zl6100.c @@ -33,6 +33,7 @@ enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 }; struct zl6100_data { int id; ktime_t access; /* chip access time */ + int delay; /* Delay between chip accesses in uS */ struct pmbus_driver_info info; }; @@ -52,10 +53,10 @@ MODULE_PARM_DESC(delay, "Delay between chip accesses in uS"); /* Some chips need a delay between accesses */ static inline void zl6100_wait(const struct zl6100_data *data) { - if (delay) { + if (data->delay) { s64 delta = ktime_us_delta(ktime_get(), data->access); - if (delta < delay) - udelay(delay - delta); + if (delta < data->delay) + udelay(data->delay - delta); } } @@ -207,8 +208,9 @@ static int zl6100_probe(struct i2c_client *client, * can be cleared later for additional chips if tests show that it * is not needed (in other words, better be safe than sorry). */ + data->delay = delay; if (data->id == zl2004 || data->id == zl6105) - delay = 0; + data->delay = 0; /* * Since there was a direct I2C device access above, wait before -- 2.20.1