V4L/DVB (7691): pvrusb2-dvb: Don't initialize if device lacks a digital side

In the end we'd like the dvb interface to always be present - even for
analog devices (via the mpeg encoder).  However right now pvrusb2-dvb
won't operate correctly if the hardware doesn't have a digital tuner,
so don't initialize the DVB interface unless we know we have a digital
tuner.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/pvrusb2/pvrusb2-dvb.c b/drivers/media/video/pvrusb2/pvrusb2-dvb.c
index f32d052..1772400 100644 (file)
--- a/drivers/media/video/pvrusb2/pvrusb2-dvb.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-dvb.c
@@ -401,16 +401,25 @@ int pvr2_dvb_init(struct pvr2_context *pvr)
 {
        int ret = 0;
        struct pvr2_dvb_adapter *adap;
+       if (!pvr->hdw->hdw_desc->dvb_props) {
+               /* Device lacks a digital interface so don't set up
+                  the DVB side of the driver either.  For now. */
+               return 0;
+       }
        adap = &pvr->hdw->dvb;
        pvr2_channel_init(&adap->channel, pvr);
        adap->channel.check_func = pvr2_dvb_internal_check;
        init_waitqueue_head(&adap->buffer_wait_data);
        mutex_init(&pvr->hdw->dvb.lock);
        ret = pvr2_dvb_adapter_init(&pvr->hdw->dvb);
-       if (ret < 0) goto fail;
+       if (ret < 0) goto fail1;
        ret = pvr2_dvb_frontend_init(&pvr->hdw->dvb);
-       return ret;
-fail:
+       if (ret < 0) goto fail2;
+       return 0;
+
+fail2:
+       pvr2_dvb_adapter_exit(adap);
+fail1:
        pvr2_channel_done(&adap->channel);
        return ret;
 }