V4L/DVB (4657): Power control of the device for dual board

Corrected power control of the device for dual boards

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 10 insertions, 3 deletions

diff --git a/drivers/media/dvb/dvb-usb/dvb-usb-init.c b/drivers/media/dvb/dvb-usb/dvb-usb-init.c
index 0dd90d1fe67c..ffdde83d1e77 100644
--- a/drivers/media/dvb/dvb-usb/dvb-usb-init.c
+++ b/drivers/media/dvb/dvb-usb/dvb-usb-init.c
@@ -136,7 +136,7 @@ static int dvb_usb_init(struct dvb_usb_device *d)
                 if (d->priv == NULL) {
                         err("no memory for priv in 'struct dvb_usb_device'");
                         return -ENOMEM;
-        }
+                }
         }
 
 /* check the capabilities and set appropriate variables */
@@ -197,8 +197,13 @@ static struct dvb_usb_device_description * dvb_usb_find_device(struct usb_device
 
 int dvb_usb_device_power_ctrl(struct dvb_usb_device *d, int onoff)
 {
-        if (d->powered == !onoff) {
-                d->powered = onoff;
+        if (onoff)
+                d->powered++;
+        else
+                d->powered--;
+
+        if (d->powered == 0 || (onoff && d->powered == 1)) { // when switching from 1 to 0 or from 0 to 1
+                deb_info("power control: %d\n", onoff);
                 if (d->props.power_ctrl)
                         return d->props.power_ctrl(d, onoff);
         }
diff --git a/drivers/media/dvb/dvb-usb/dvb-usb.h b/drivers/media/dvb/dvb-usb/dvb-usb.h
index 2ec7c777fcef..376c45a8e779 100644
--- a/drivers/media/dvb/dvb-usb/dvb-usb.h
+++ b/drivers/media/dvb/dvb-usb/dvb-usb.h
@@ -325,6 +325,8 @@ struct dvb_usb_adapter {
  * @desc: pointer to the device's struct dvb_usb_device_description.
  * @state: initialization and runtime state of the device.
  *
+ * @powered: indicated whether the device is power or not.
+ *  Powered is in/decremented for each call to modify the state.
  * @udev: pointer to the device's struct usb_device.
  *
  * @usb_mutex: semaphore of USB control messages (reading needs two messages)