V4L/DVB (3895): Additional frontend_init safety checks

Don't try and set the tuner ops if the demod was not detected.

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/media/dvb/ttpci/av7110.c b/drivers/media/dvb/ttpci/av7110.c
index 939a493b5251..5f976d5eda42 100644
--- a/drivers/media/dvb/ttpci/av7110.c
+++ b/drivers/media/dvb/ttpci/av7110.c
@@ -2083,7 +2083,9 @@ static int frontend_init(struct av7110 *av7110)
                 case 0x0000: // Fujitsu/Siemens DVB-Cable (ves1820/Philips CD1516(??))
                         av7110->fe = ves1820_attach(&philips_cd1516_config,
                                                     &av7110->i2c_adap, read_pwm(av7110));
-                        av7110->fe->ops->tuner_ops.set_params = philips_cd1516_tuner_set_params;
+                        if (av7110->fe) {
+                                av7110->fe->ops->tuner_ops.set_params = philips_cd1516_tuner_set_params;
+                        }
                         break;
                 }
 
@@ -2134,13 +2136,17 @@ static int frontend_init(struct av7110 *av7110)
                                 /* Siemens DVB-C (full-length card) VES1820/Philips CD1516 */
                                 av7110->fe = ves1820_attach(&philips_cd1516_config, &av7110->i2c_adap,
                                                         read_pwm(av7110));
-                                av7110->fe->ops->tuner_ops.set_params = philips_cd1516_tuner_set_params;
+                                if (av7110->fe) {
+                                        av7110->fe->ops->tuner_ops.set_params = philips_cd1516_tuner_set_params;
+                                }
                                 break;
                         case 0x0003:
                                 /* Hauppauge DVB-C 2.1 VES1820/ALPS TDBE2 */
                                 av7110->fe = ves1820_attach(&alps_tdbe2_config, &av7110->i2c_adap,
                                                         read_pwm(av7110));
-                                av7110->fe->ops->tuner_ops.set_params = alps_tdbe2_tuner_set_params;
+                                if (av7110->fe) {
+                                        av7110->fe->ops->tuner_ops.set_params = alps_tdbe2_tuner_set_params;
+                                }
                                 break;
                         }
                         break;
@@ -2149,13 +2155,17 @@ static int frontend_init(struct av7110 *av7110)
 
                         // ALPS TDLB7
                         av7110->fe = sp8870_attach(&alps_tdlb7_config, &av7110->i2c_adap);
-                        av7110->fe->ops->tuner_ops.set_params = alps_tdlb7_tuner_set_params;
+                        if (av7110->fe) {
+                                av7110->fe->ops->tuner_ops.set_params = alps_tdlb7_tuner_set_params;
+                        }
                         break;
 
                 case 0x0002: // Hauppauge/TT DVB-C premium rev2.X
 
                         av7110->fe = ves1820_attach(&alps_tdbe2_config, &av7110->i2c_adap, read_pwm(av7110));
-                        av7110->fe->ops->tuner_ops.set_params = alps_tdbe2_tuner_set_params;
+                        if (av7110->fe) {
+                                av7110->fe->ops->tuner_ops.set_params = alps_tdbe2_tuner_set_params;
+                        }
                         break;
 
                 case 0x0004: // Galaxis DVB-S rev1.3
@@ -2185,7 +2195,9 @@ static int frontend_init(struct av7110 *av7110)
                 case 0x0008: // Hauppauge/TT DVB-T
 
                         av7110->fe = l64781_attach(&grundig_29504_401_config, &av7110->i2c_adap);
-                        av7110->fe->ops->tuner_ops.set_params = grundig_29504_401_tuner_set_params;
+                        if (av7110->fe) {
+                                av7110->fe->ops->tuner_ops.set_params = grundig_29504_401_tuner_set_params;
+                        }
                         break;
 
                 case 0x000A: // Hauppauge/TT Nexus-CA rev1.X