From e8beb02343e7582980c6705816cd957cf4f74c7a Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 3 Feb 2016 17:33:48 -0200 Subject: [media] tda1004x: only update the frontend properties if locked The tda1004x was updating the properties cache before locking. If the device is not locked, the data at the registers are just random values with no real meaning. This caused the driver to fail with libdvbv5, as such library calls GET_PROPERTY from time to time, in order to return the DVB stats. Tested with a saa7134 card 78: ASUSTeK P7131 Dual, vendor PCI ID: 1043:4862 Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/tda1004x.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers') diff --git a/drivers/media/dvb-frontends/tda1004x.c b/drivers/media/dvb-frontends/tda1004x.c index 0e209b56c76c..c6abeb4fba9d 100644 --- a/drivers/media/dvb-frontends/tda1004x.c +++ b/drivers/media/dvb-frontends/tda1004x.c @@ -903,9 +903,18 @@ static int tda1004x_get_fe(struct dvb_frontend *fe) { struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache; struct tda1004x_state* state = fe->demodulator_priv; + int status; dprintk("%s\n", __func__); + status = tda1004x_read_byte(state, TDA1004X_STATUS_CD); + if (status == -1) + return -EIO; + + /* Only update the properties cache if device is locked */ + if (!(status & 8)) + return 0; + // inversion status fe_params->inversion = INVERSION_OFF; if (tda1004x_read_byte(state, TDA1004X_CONFC1) & 0x20) -- cgit v1.2.3