[PATCH] dvb: dib3000: add NULL pointer check

prevent NULL pointer related Oopses (Patrick Boettcher)
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/media/dvb/frontends/dib3000mb.c

@@ -61,7 +61,7 @@ static int dib3000mb_set_frontend(struct dvb_frontend* fe,
 	fe_code_rate_t fe_cr = FEC_NONE;
 	int search_state, seq;
 
-	if (tuner) {
+	if (tuner && state->config.pll_addr && state->config.pll_set) {
 		dib3000mb_tuner_pass_ctrl(fe,1,state->config.pll_addr(fe));
 		state->config.pll_set(fe, fep, NULL);
 		dib3000mb_tuner_pass_ctrl(fe,0,state->config.pll_addr(fe));

drivers/media/dvb/frontends/dib3000mc.c

@@ -463,7 +463,7 @@ static int dib3000mc_set_frontend(struct dvb_frontend* fe,
 	int search_state,auto_val;
 	u16 val;
 
-	if (tuner) { /* initial call from dvb */
+	if (tuner && state->config.pll_addr && state->config.pll_set) { /* initial call from dvb */
 		dib3000mc_tuner_pass_ctrl(fe,1,state->config.pll_addr(fe));
 		state->config.pll_set(fe,fep,NULL);
 		dib3000mc_tuner_pass_ctrl(fe,0,state->config.pll_addr(fe));