[v2,for,v4l-dvb,master] V4L/DVB: budget: Oops: "BUG: unable to handle kernel NULL pointer dereference"

Commit Message

Bjørn Mork March 24, 2010, 1:30 p.m. UTC

None

Patch

diff --git a/drivers/media/dvb/ttpci/budget.c b/drivers/media/dvb/ttpci/budget.c
index fccb6ad..918679e 100644
--- a/drivers/media/dvb/ttpci/budget.c
+++ b/drivers/media/dvb/ttpci/budget.c
@@ -628,32 +628,36 @@  static void frontend_init(struct budget *budget)
 						 &tt1600_stv6110x_config,
 						 &budget->i2c_adap);
 
-				tt1600_stv090x_config.tuner_init	  = ctl->tuner_init;
-				tt1600_stv090x_config.tuner_sleep	  = ctl->tuner_sleep;
-				tt1600_stv090x_config.tuner_set_mode	  = ctl->tuner_set_mode;
-				tt1600_stv090x_config.tuner_set_frequency = ctl->tuner_set_frequency;
-				tt1600_stv090x_config.tuner_get_frequency = ctl->tuner_get_frequency;
-				tt1600_stv090x_config.tuner_set_bandwidth = ctl->tuner_set_bandwidth;
-				tt1600_stv090x_config.tuner_get_bandwidth = ctl->tuner_get_bandwidth;
-				tt1600_stv090x_config.tuner_set_bbgain	  = ctl->tuner_set_bbgain;
-				tt1600_stv090x_config.tuner_get_bbgain	  = ctl->tuner_get_bbgain;
-				tt1600_stv090x_config.tuner_set_refclk	  = ctl->tuner_set_refclk;
-				tt1600_stv090x_config.tuner_get_status	  = ctl->tuner_get_status;
-
-				/* call the init function once to initialize
-				   tuner's clock output divider and demod's
-				   master clock */
-				if (budget->dvb_frontend->ops.init)
-					budget->dvb_frontend->ops.init(budget->dvb_frontend);
-
-				dvb_attach(isl6423_attach,
-					budget->dvb_frontend,
-					&budget->i2c_adap,
-					&tt1600_isl6423_config);
-
-			} else {
-				dvb_frontend_detach(budget->dvb_frontend);
-				budget->dvb_frontend = NULL;
+				if (ctl) {
+					tt1600_stv090x_config.tuner_init	  = ctl->tuner_init;
+					tt1600_stv090x_config.tuner_sleep	  = ctl->tuner_sleep;
+					tt1600_stv090x_config.tuner_set_mode	  = ctl->tuner_set_mode;
+					tt1600_stv090x_config.tuner_set_frequency = ctl->tuner_set_frequency;
+					tt1600_stv090x_config.tuner_get_frequency = ctl->tuner_get_frequency;
+					tt1600_stv090x_config.tuner_set_bandwidth = ctl->tuner_set_bandwidth;
+					tt1600_stv090x_config.tuner_get_bandwidth = ctl->tuner_get_bandwidth;
+					tt1600_stv090x_config.tuner_set_bbgain	  = ctl->tuner_set_bbgain;
+					tt1600_stv090x_config.tuner_get_bbgain	  = ctl->tuner_get_bbgain;
+					tt1600_stv090x_config.tuner_set_refclk	  = ctl->tuner_set_refclk;
+					tt1600_stv090x_config.tuner_get_status	  = ctl->tuner_get_status;
+
+					/* call the init function once to initialize
+					   tuner's clock output divider and demod's
+					   master clock */
+					if (budget->dvb_frontend->ops.init)
+						budget->dvb_frontend->ops.init(budget->dvb_frontend);
+
+					if (dvb_attach(isl6423_attach,
+						       budget->dvb_frontend,
+						       &budget->i2c_adap,
+						       &tt1600_isl6423_config) == NULL) {
+						printk("%s: No Intersil ISL6423 found!\n", __func__);
+						goto error_out;
+					}
+				} else {
+					printk("%s: No STV6110(A) Silicon Tuner found!\n", __func__);
+					goto error_out;
+				}
 			}
 		}
 		break;