mirror of https://gitee.com/openkylin/linux.git
bb31d2381c
GET_FRONTEND and G_PROPERTY can be called anytime, even when the tuner/demod is not fully locked. However, several parameters returned by those calls are available only after the demod get VITERBI lock. While several drivers do the right thing by checking the status before returning the parameter, some drivers simply blindly update the DTV properties cache without checking if the registers at the hardware contain valid values. Due to that, programs that call G_PROPERTY (or GET_FRONTEND) before having a tuner lock may interfere at the zigzag logic, as the DVB kthread calls the set_frontend() callback several times, to fine tune the frequency and to identify if the signal is inverted or not. While the drivers should be fixed to report the right status, we should prevent that such bugs would actually interfere at the device operation. So, let's use a separate var for userspace calls to get frontend. As we copy the content of the cache, this should not cause any troubles. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| demux.h | ||
| dmxdev.c | ||
| dmxdev.h | ||
| dvb-usb-ids.h | ||
| dvb_ca_en50221.c | ||
| dvb_ca_en50221.h | ||
| dvb_demux.c | ||
| dvb_demux.h | ||
| dvb_filter.c | ||
| dvb_filter.h | ||
| dvb_frontend.c | ||
| dvb_frontend.h | ||
| dvb_math.c | ||
| dvb_math.h | ||
| dvb_net.c | ||
| dvb_net.h | ||
| dvb_ringbuffer.c | ||
| dvb_ringbuffer.h | ||
| dvbdev.c | ||
| dvbdev.h | ||