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V4L/DVB: budget: Oops: "BUG: unable to handle kernel NULL pointer dereference"

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Never call dvb_frontend_detach if we failed to attach a frontend. This fixes
the following oops:

[    8.172997] DVB: registering new adapter (TT-Budget S2-1600 PCI)
[    8.209018] adapter has MAC addr = 00:d0:5c:cc:a7:29
[    8.328665] Intel ICH 0000:00:1f.5: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[    8.328753] Intel ICH 0000:00:1f.5: setting latency timer to 64
[    8.562047] DVB: Unable to find symbol stv090x_attach()
[    8.562117] BUG: unable to handle kernel NULL pointer dereference at 000000ac
[    8.562239] IP: [<e08b04a3>] dvb_frontend_detach+0x4/0x67 [dvb_core]

Ref http://bugs.debian.org/575207

Also clean up if we are unable to register the tuner and LNB drivers

[mchehab@redhat.com: add printk log level, to calm down chechpatch.pl]
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Reported-by: Fladischer Michael <FladischerMichael@fladi.at>
Acked-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Bjørn Mork 2010-03-24 10:30:15 -03:00 committed by Mauro Carvalho Chehab
parent 784a493168
commit dd0bbcc626
1 changed files with 28 additions and 21 deletions
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49
drivers/media/dvb/ttpci/budget.c
View file

@ -628,29 +628,36 @@ static void frontend_init(struct budget *budget)
&tt1600_stv6110x_config, &tt1600_stv6110x_config,
&budget->i2c_adap); &budget->i2c_adap);
tt1600_stv090x_config.tuner_init = ctl->tuner_init; if (ctl) {
tt1600_stv090x_config.tuner_sleep = ctl->tuner_sleep; tt1600_stv090x_config.tuner_init = ctl->tuner_init;
tt1600_stv090x_config.tuner_set_mode = ctl->tuner_set_mode; tt1600_stv090x_config.tuner_sleep = ctl->tuner_sleep;
tt1600_stv090x_config.tuner_set_frequency = ctl->tuner_set_frequency; tt1600_stv090x_config.tuner_set_mode = ctl->tuner_set_mode;
tt1600_stv090x_config.tuner_get_frequency = ctl->tuner_get_frequency; tt1600_stv090x_config.tuner_set_frequency = ctl->tuner_set_frequency;
tt1600_stv090x_config.tuner_set_bandwidth = ctl->tuner_set_bandwidth; tt1600_stv090x_config.tuner_get_frequency = ctl->tuner_get_frequency;
tt1600_stv090x_config.tuner_get_bandwidth = ctl->tuner_get_bandwidth; tt1600_stv090x_config.tuner_set_bandwidth = ctl->tuner_set_bandwidth;
tt1600_stv090x_config.tuner_set_bbgain = ctl->tuner_set_bbgain; tt1600_stv090x_config.tuner_get_bandwidth = ctl->tuner_get_bandwidth;
tt1600_stv090x_config.tuner_get_bbgain = ctl->tuner_get_bbgain; tt1600_stv090x_config.tuner_set_bbgain = ctl->tuner_set_bbgain;
tt1600_stv090x_config.tuner_set_refclk = ctl->tuner_set_refclk; tt1600_stv090x_config.tuner_get_bbgain = ctl->tuner_get_bbgain;
tt1600_stv090x_config.tuner_get_status = ctl->tuner_get_status; 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 /* call the init function once to initialize
tuner's clock output divider and demod's tuner's clock output divider and demod's
master clock */ master clock */
if (budget->dvb_frontend->ops.init) if (budget->dvb_frontend->ops.init)
budget->dvb_frontend->ops.init(budget->dvb_frontend); budget->dvb_frontend->ops.init(budget->dvb_frontend);
dvb_attach(isl6423_attach,
budget->dvb_frontend,
&budget->i2c_adap,
&tt1600_isl6423_config);
if (dvb_attach(isl6423_attach,
budget->dvb_frontend,
&budget->i2c_adap,
&tt1600_isl6423_config) == NULL) {
printk(KERN_ERR "%s: No Intersil ISL6423 found!\n", __func__);
goto error_out;
}
} else {
printk(KERN_ERR "%s: No STV6110(A) Silicon Tuner found!\n", __func__);
goto error_out;
}
} }
} }
break; break;