V4L/DVB (4211): Fix an Oops for all fe that have get_frontend_algo == NULL

Thanks to Johannes Stezenbach for pointing it out

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 15 insertions, 13 deletions

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 3152a54a2539..9be41e4c2fda 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -556,21 +556,23 @@ static int dvb_frontend_thread(void *data)
                 }
 
                 /* do an iteration of the tuning loop */
-                if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
-                        /* have we been asked to retune? */
-                        params = NULL;
-                        if (fepriv->state & FESTATE_RETUNE) {
-                                params = &fepriv->parameters;
-                                fepriv->state = FESTATE_TUNED;
-                        }
+                if (fe->ops.get_frontend_algo) {
+                        if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
+                                /* have we been asked to retune? */
+                                params = NULL;
+                                if (fepriv->state & FESTATE_RETUNE) {
+                                        params = &fepriv->parameters;
+                                        fepriv->state = FESTATE_TUNED;
+                                }
 
-                        fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
-                        if (s != fepriv->status) {
-                                dvb_frontend_add_event(fe, s);
-                                fepriv->status = s;
+                                fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
+                                if (s != fepriv->status) {
+                                        dvb_frontend_add_event(fe, s);
+                                        fepriv->status = s;
+                                }
+                        } else {
+                                dvb_frontend_swzigzag(fe);
                         }
-                } else {
-                        dvb_frontend_swzigzag(fe);
                 }
         }