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[media] smiapp: Fix power count handling 

The sensor may be powered by either one of its sub-devices being accessed
from the user space (an open file handle) or by its s_power() op being
called with non-zero on argument. The driver counts the users and if any
reason to keep the device powered exists it will be powered.

However, a faulty condition was used in recognising the need to power off
the sensor, leading it to be powered off every time any of its uses went
away.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Sakari Ailus 2014-08-05 08:01:08 -03:00 committed by Mauro Carvalho Chehab
parent 7d1311b93e
commit 58e43d90b9
1 changed files with 2 additions and 9 deletions
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11
drivers/media/i2c/smiapp/smiapp-core.c
View File

@ -1282,19 +1282,12 @@ static int smiapp_set_power(struct v4l2_subdev *subdev, int on)
mutex_lock(&sensor->power_mutex);
/*
* If the power count is modified from 0 to != 0 or from != 0
* to 0, update the power state.
*/
if (!sensor->power_count == !on)
goto out;
if (on) {
if (on && !sensor->power_count) {
/* Power on and perform initialisation. */
ret = smiapp_power_on(sensor);
if (ret < 0)
goto out;
} else {
} else if (!on && sensor->power_count == 1) {
smiapp_power_off(sensor);
}