Re: Backport of a 2.6.x USB driver to 2.4.32 - help needed

[Robert Hancock <hancockr@shaw.ca>]

Jesper Juhl wrote:
> On 06/06/06, Heiko Gerstung <heiko.gerstung@meinberg.de> wrote:
>> Hi!
>>
>> Short Version (tm): I try to backport a USB driver (rtl8150.c) from
>> 2.6.15.x to 2.4.32 and have no idea how to substitue two functions:
>> in_atomic() and schedule_timeout_uninterruptible() ... I really would
>> appreciate any help, because I am no kernel hacker at all ...
>>
> in_atomic() is used to test if the kernel is in a state where sleeping
> is allowed or not. The 2.4.x kernel is not preemptive and has quite
> coarse grained SMP support (the BKL "Big Kernel Lock"), it didin't
> need in_atomic() in the same way as 2.6.x does.

There's little difference in the need for it, 2.4 just doesn't have it. 
I don't see a call to that function in that driver's code though?

> 
> schedule_timeout_uninterruptible() is used to sleep on a wait-queue,
> which 2.4.x does not have.

Huh? 2.4 did have wait queues, but that call has nothing to do with 
them. You should be able to replace it with:

set_current_state( TASK_UNINTERRUPTIBLE );
schedule_timeout( timeout );

-- 
Robert Hancock      Saskatoon, SK, Canada
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