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V4L/DVB (12686): dvb-core: check supported QAM modulations

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Check the modulation in dvb_frontend_check_parameters against
frontend's capabilties for FE_QAM devices.

Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Janne Grunau 2009-09-01 19:24:08 -03:00 committed by Mauro Carvalho Chehab
parent 01886255dd
commit f51fad85af
1 changed files with 9 additions and 0 deletions
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9
drivers/media/dvb/dvb-core/dvb_frontend.c
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@ -838,6 +838,15 @@ static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
}
}
/* check for supported modulation */
if (fe->ops.info.type == FE_QAM &&
(parms->u.qam.modulation > QAM_AUTO ||
!((1 << (parms->u.qam.modulation + 10)) & fe->ops.info.caps))) {
printk(KERN_WARNING "DVB: adapter %i frontend %i modulation %u not supported\n",
fe->dvb->num, fe->id, parms->u.qam.modulation);
return -EINVAL;
}
return 0;
}