From e792b162282b2a6897d82cb48a3ee6222bc01686 Mon Sep 17 00:00:00 2001 From: "darron@kewl.org" Date: Sat, 11 Oct 2008 15:44:05 +0100 Subject: MFE: Add multi-frontend mutual exclusion From: Darron Broad 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. Priority: normal Signed-off-by: Darron Broad --- linux/include/media/videobuf-dvb.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'linux/include') diff --git a/linux/include/media/videobuf-dvb.h b/linux/include/media/videobuf-dvb.h index 47bc2c5e7..1a401f732 100644 --- a/linux/include/media/videobuf-dvb.h +++ b/linux/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