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V4L/DVB (9618): tvaudio: add additional logic to avoid OOPS

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This patch checks for volume, bass, treble, set mode and get mode
callbacks before actually enabling the code that would use them.

Instead of aborting the driver for load, this patch will allow it to
load with a reduced number of functionatities.

This prevents OOPS if some board entry is missing a needed callback.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2008-11-13 14:01:15 -03:00
parent dd03e970a1
commit 099b7fcc77
1 changed files with 37 additions and 8 deletions
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41
drivers/media/video/tvaudio.c
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@ -1511,20 +1511,49 @@ static int chip_probe(struct i2c_client *client, const struct i2c_device_id *id)
chip_cmd(chip,"init",&desc->init);
if (desc->flags & CHIP_HAS_VOLUME) {
if (!desc->volfunc) {
/* This shouldn't be happen. Warn user, but keep working
without volume controls
*/
v4l_info(chip->c, "volume callback undefined!\n");
desc->flags &= ~CHIP_HAS_VOLUME;
} else {
chip->left = desc->leftinit ? desc->leftinit : 65535;
chip->right = desc->rightinit ? desc->rightinit : 65535;
chip_write(chip,desc->leftreg,desc->volfunc(chip->left));
chip_write(chip,desc->rightreg,desc->volfunc(chip->right));
chip_write(chip, desc->leftreg,
desc->volfunc(chip->left));
chip_write(chip, desc->rightreg,
desc->volfunc(chip->right));
}
}
if (desc->flags & CHIP_HAS_BASSTREBLE) {
chip->treble = desc->trebleinit ? desc->trebleinit : 32768;
chip->bass = desc->bassinit ? desc->bassinit : 32768;
chip_write(chip,desc->bassreg,desc->bassfunc(chip->bass));
chip_write(chip,desc->treblereg,desc->treblefunc(chip->treble));
if (!desc->bassfunc || !desc->treblefunc) {
/* This shouldn't be happen. Warn user, but keep working
without bass/treble controls
*/
v4l_info(chip->c, "bass/treble callbacks undefined!\n");
desc->flags &= ~CHIP_HAS_BASSTREBLE;
} else {
chip->treble = desc->trebleinit ?
desc->trebleinit : 32768;
chip->bass = desc->bassinit ?
desc->bassinit : 32768;
chip_write(chip, desc->bassreg,
desc->bassfunc(chip->bass));
chip_write(chip, desc->treblereg,
desc->treblefunc(chip->treble));
}
}
chip->thread = NULL;
if (desc->flags & CHIP_NEED_CHECKMODE) {
if (!desc->getmode || !desc->setmode) {
/* This shouldn't be happen. Warn user, but keep working
without kthread
*/
v4l_info(chip->c, "set/get mode callbacks undefined!\n");
return 0;
}
/* start async thread */
init_timer(&chip->wt);
chip->wt.function = chip_thread_wake;