V4L/DVB (7692): pvrusb2-dvb: Further clean up dvb init/tear-down

Move pvr2_dvb_adapter usage out of the pvrusb2 driver core - it's
really private to the pvrusb2-dvb module and nothing outside of the
dvb implementation should care about it.  Creation / destruction of
the pvr2_dvb_adapter instance is now contained entirely within
pvrusb2-dvb.c.
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/pvrusb2-dvb.c

@@ -381,12 +381,13 @@ static int pvr2_dvb_frontend_exit(struct pvr2_dvb_adapter *adap)
 	return 0;
 }
 
-static void pvr2_dvb_done(struct pvr2_dvb_adapter *adap)
+static void pvr2_dvb_destroy(struct pvr2_dvb_adapter *adap)
 {
 	pvr2_dvb_stream_end(adap);
 	pvr2_dvb_frontend_exit(adap);
 	pvr2_dvb_adapter_exit(adap);
 	pvr2_channel_done(&adap->channel);
+	kfree(adap);
 }
 
 static void pvr2_dvb_internal_check(struct pvr2_channel *chp)
@@ -394,10 +395,10 @@ static void pvr2_dvb_internal_check(struct pvr2_channel *chp)
 	struct pvr2_dvb_adapter *adap;
 	adap = container_of(chp, struct pvr2_dvb_adapter, channel);
 	if (!adap->channel.mc_head->disconnect_flag) return;
-	pvr2_dvb_done(adap);
+	pvr2_dvb_destroy(adap);
 }
 
-int pvr2_dvb_init(struct pvr2_context *pvr)
+struct pvr2_dvb_adapter *pvr2_dvb_create(struct pvr2_context *pvr)
 {
 	int ret = 0;
 	struct pvr2_dvb_adapter *adap;
@@ -406,21 +407,22 @@ int pvr2_dvb_init(struct pvr2_context *pvr)
 		   the DVB side of the driver either.  For now. */
 		return 0;
 	}
-	adap = &pvr->hdw->dvb;
+	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
+	if (!adap) return adap;
 	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);
+	mutex_init(&adap->lock);
+	ret = pvr2_dvb_adapter_init(adap);
 	if (ret < 0) goto fail1;
-	ret = pvr2_dvb_frontend_init(&pvr->hdw->dvb);
+	ret = pvr2_dvb_frontend_init(adap);
 	if (ret < 0) goto fail2;
-	return 0;
+	return adap;
 
 fail2:
 	pvr2_dvb_adapter_exit(adap);
 fail1:
 	pvr2_channel_done(&adap->channel);
-	return ret;
+	return NULL;
 }
 

drivers/media/video/pvrusb2/pvrusb2-dvb.h

@@ -36,6 +36,6 @@ struct pvr2_dvb_props {
 	int (*tuner_attach) (struct pvr2_dvb_adapter *);
 };
 
-int pvr2_dvb_init(struct pvr2_context *pvr);
+struct pvr2_dvb_adapter *pvr2_dvb_create(struct pvr2_context *pvr);
 
 #endif /* __PVRUSB2_DVB_H__ */

drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h

@@ -41,7 +41,6 @@
 #include "pvrusb2-io.h"
 #include <media/cx2341x.h>
 #include "pvrusb2-devattr.h"
-#include "pvrusb2-dvb.h"
 
 /* Legal values for PVR2_CID_HSM */
 #define PVR2_CVAL_HSM_FAIL 0
@@ -374,8 +373,6 @@ struct pvr2_hdw {
 
 	struct pvr2_ctrl *controls;
 	unsigned int control_cnt;
-
-	struct pvr2_dvb_adapter dvb;
 };
 
 /* This function gets the current frequency */

drivers/media/video/pvrusb2/pvrusb2-main.c

@@ -62,7 +62,7 @@ static void pvr_setup_attach(struct pvr2_context *pvr)
 	pvr2_v4l2_create(pvr);
 #ifdef CONFIG_VIDEO_PVRUSB2_DVB
 	/* Create association with dvb layer */
-	pvr2_dvb_init(pvr);
+	pvr2_dvb_create(pvr);
 #endif
 #ifdef CONFIG_VIDEO_PVRUSB2_SYSFS
 	pvr2_sysfs_create(pvr,class_ptr);