From 59b1842da1c6f33ad2e8da82d3dfb3445751d964 Mon Sep 17 00:00:00 2001 From: Darron Broad Date: Sat, 11 Oct 2008 11:44:05 -0300 Subject: V4L/DVB (9227): MFE: Add multi-frontend mutual exclusion This add frontend R/W mutual exclusion. Prior to this point in time it was possible to open both frontends simultaneously which an MFE card cannot support. In order to stop this, a delayed open is performed which has the following function: - Return EBUSY after a configurable amount of time if a frontend is unavailable due to the other being in use. - Only allow opening of a frontend if the kernel thread of the other has stopped. This solution was chosen to allow switching between frontends to work as seamlessly as possible. When both frontends are actually opened simultaneously then one will only open, but if quick switching is performed between one of many then the new open will succeed in a clean fashion rather than interrupting a kernel thread. Signed-off-by: Darron Broad Signed-off-by: Mauro Carvalho Chehab --- include/media/videobuf-dvb.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include/media') diff --git a/include/media/videobuf-dvb.h b/include/media/videobuf-dvb.h index 47bc2c5e7ba..1a401f7320b 100644 --- a/include/media/videobuf-dvb.h +++ b/include/media/videobuf-dvb.h @@ -43,7 +43,8 @@ int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f, struct module *module, void *adapter_priv, struct device *device, - short *adapter_nr); //NEW + short *adapter_nr, + int mfe_shared); void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f); @@ -52,7 +53,8 @@ int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *f, void *adapter_priv, struct device *device, char *adapter_name, - short *adapter_nr); //NEW + short *adapter_nr, + int mfe_shared); int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_dvb *dvb); -- cgit v1.2.3