| Date | Thu, 28 Jan 2016 16:07:11 +0000 | From | One Thousand Gnomes <> | Subject | Re: [PATCH 15/31] media: dvb-frontend invoke enable/disable_source handlers |
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On Thu, 28 Jan 2016 13:53:04 -0200 Mauro Carvalho Chehab <mchehab@osg.samsung.com> wrote:
> Em Wed, 6 Jan 2016 13:27:04 -0700 > Shuah Khan <shuahkh@osg.samsung.com> 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
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