[media] dvb-core: preserve the delivery system at cache clear

The changeset 240ab508aa is incomplete, as the first thing that
happens at cache clear is to do a memset with 0 to the cache.

So, the delivery system needs to be explicitly preserved there.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 2ad7faf4529d..f5fa7aa89618 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -904,8 +904,11 @@ static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 {
         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
         int i;
+        u32 delsys;
 
+        delsys = c->delivery_system;
         memset(c, 0, sizeof(struct dtv_frontend_properties));
+        c->delivery_system = delsys;
 
         c->state = DTV_CLEAR;