V4L/DVB (7538): Adds selectable adapter numbers as per module option

The adapter_nr module options can be used to allocate static adapter
numbers on a driver level. It avoids problems with changing DVB apapter
numbers after warm/cold boot or device unplugging and repluging.

Each driver holds DVB_MAX_ADAPTER long array of the preferred order of
adapter numbers.

options dvb-usb-dib0700 adapter_nr=7,6,5,4,3,2,1,0 would result in a
reversed allocation of adapter numbers.

With adapter_nr=2,5 it tries first to get adapter number 2 and 5. If
both are already in use it will allocate the lowest free adapter number.

Signed-off-by: Janne Grunau <janne-dvb@grunau.be>
Acked-by: Hermann Pitton <hermann.pitton@arcor.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/media/video/videobuf-dvb.c b/drivers/media/video/videobuf-dvb.c
index 4ba8b7db7fda..0f8542a4c71a 100644
--- a/drivers/media/video/videobuf-dvb.c
+++ b/drivers/media/video/videobuf-dvb.c
@@ -138,14 +138,16 @@ static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 int videobuf_dvb_register(struct videobuf_dvb *dvb,
                           struct module *module,
                           void *adapter_priv,
-                          struct device *device)
+                          struct device *device,
+                          short *adapter_nr)
 {
         int result;
 
         mutex_init(&dvb->lock);
 
         /* register adapter */
-        result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
+        result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
+                                      adapter_nr);
         if (result < 0) {
                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
                        dvb->name, result);