On Thu, 28 Jan 2016 13:53:04 -0200 Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx> wrote: > Em Wed, 6 Jan 2016 13:27:04 -0700 > Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> escreveu: > > > Checking for tuner availability from frontend thread start > > disrupts video stream. Change to check for tuner and start > > pipeline from frontend open instead and stop pipeline from > > frontend release. > > That's wrong, as DVB can be opened on read-only mode, where > it won't be changing anything. > > Also, I don't think POSIX allows to return an error like EBUSY > on open: > http://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html It doesn't document all the errors you may return. Quite a lot of kernel drivers return EBUSY when they are "single open" things. POSIX documents certain cases that *must* error and what the error code is. It documents certain possible failures and what their error code is. Beyond that it's up to you. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
