Em 05-11-2011 15:57, Lawrence Rust escreveu: > On Sat, 2011-11-05 at 18:38 +0100, Andreas Oberritter wrote: > [snip] >> I don't get how this could be useful. MythTV knows what delivery system >> it wants to use, so it should pass this information to the kernel. >> Trying to set an invalid delivery system must fail. >> >> Using SYS_UNDEFINED as a pre-set default is different from setting >> SYS_UNDEFINED from userspace, which should always generate an error IMO, >> unless this is documented otherwise in the API specification. > > It's not ideal that MythTV is setting DTV_DELIVERY_SYSTEM to 0 and I > have filed a bug against this. But that doesn't change the fact that > the original patch significantly changed user parameter handling for no > significant benefit. MythTV is probably the biggest client of v4l and > will greatly hinder users upgrading to (Myth)Ubuntu 12.04 or Fedora 16 > both of which use Linux 3.x. Regression is a bad thing. However, in this specific case, I agree with Andreas: an assumption that the Kernel will replace SYS_UNDEFINED by something else is a very bad thing. It also hides a bug, as there are no way for devices that support more than one delivery system to properly select the desired one. So, this patch won't fix it. So, I suspect that you'll need to open a BZ also at Ubuntu and Fedora, in order to backport the MythTV fix into them. Regards, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
