From f51fad85af7b296b56031747c873c309b24ff77c Mon Sep 17 00:00:00 2001
From: Janne Grunau <j@jannau.net>
Date: Tue, 1 Sep 2009 19:24:08 -0300
Subject: V4L/DVB (12686): dvb-core: check supported QAM modulations
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>
---
drivers/media/dvb/dvb-core/dvb_frontend.c | 9 +++++++++
1 file changed, 9 insertions(+)
(limited to 'drivers')
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 0cb6c09719f..d13ebcb0c6b 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -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;
}
--
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