Re: V4L-DVB drivers and BKL

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

Mauro Carvalho Chehab wrote:
> Hans Verkuil wrote:
>> On the DVB side there seem to be only two sources that use the BKL:
>>
>> linux/drivers/media/dvb/bt8xx/dst_ca.c: lock_kernel();
>> linux/drivers/media/dvb/bt8xx/dst_ca.c: unlock_kernel();
>> linux/drivers/media/dvb/dvb-core/dvbdev.c:      lock_kernel();
>> linux/drivers/media/dvb/dvb-core/dvbdev.c:              unlock_kernel();
>> linux/drivers/media/dvb/dvb-core/dvbdev.c:      unlock_kernel();
>>
>> At first glance it doesn't seem too difficult to remove them, but I leave
>> that to the DVB experts.
> 
> The main issue is at dvbdev, since it is used by all devices. We need to get rid
> of it.

Get rid of its lock_kernel in open and its locked ioctl, or of the
dvbdev 'library' itself?

> That's said, Stefan Richter sent a patch meant to reduce the issues with
> DVB. Unfortunately, I haven't seen any comments on it. It would be really important
> to test his approach.

I will attempt to continue with this (convert more drivers if not all,
in a properly organized patch series for review), though it won't happen
overnight as I'm chronically short of spare time.  I.e. if others step
in, even better.
-- 
Stefan Richter
-=====-==-=- -=-- ---==
http://arcgraph.de/sr/