[linux-dvb] Re: Kernel OOPS

[Johannes Stezenbach <js@convergence.de>]

mws@renzel.net wrote:
> 
> i am playing around with the DVR device for playing back a TS which was recorded from the DVR device.
...
> The kernel is configured a an SMP Kernel and Preemptible feature.

That's a recipe for disaster -- the dvr playback code in the av7110
is seriously b0rked. Apart from the bug you found, the dvr device
does not support non-blocking writes, and if you try to use multiple
threads and do video ioctls from one thread while another thread
blocks in dvr write() your machine will lock up...

> The output from dmesg after Oopsing is :
> 
> bad: scheduling while atomic!
> Call Trace:

Just for the record, this is not an Oops, just an indication
that the driver is buggy.

> anybody you can help me out of this?

The problem is that the av7110 hardware does not support TS playback.
The driver tries to work around this by remuxing the TS into PES
and feeding PES to the hardware. IMHO this code should be dropped
rather than attempted to fix.
Remuxing should be done in user space. VDR does the right thing.

Johannes


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