[hsflinux] HSF Driver Development for linux-2.5.x

Antonino Daplas adaplas at pol.net
Tue Jan 20 01:56:32 EST 2004

On Sat, 2002-10-26 at 23:25, Antonino Daplas wrote:
> Hi,
> Beginning linux-2.5.40, task queues were removed and replaced by
> workqueues.  Converting the HSF driver to use workqueues instead of task
> queues is not difficult.  Unfortunately, they are available only for
> GPL'ed modules.
> The question then, is there a way to work around this?  I have already
> seen one complaint about this in the kernel mailing list concerning
> nVidia drivers.  
> Tony
To answer my own question, there is an exportable function,
schedule_work(), which is available to non-GPL'ed drivers.  The only
caveat is that the driver will not be able to create its own workqueue
(similar to the old task queue), but a default one, similar to the old
keventd, will be available.

Attached is a patch for hsflinmodem-5.03.03.L3mbsibeta02101001 that
allows the driver to utilize workqueues instead.  In my case, it's quite
stable with linux-2.5.44 and linux-2.4.19, gcc-3.2, with Conexant HSF
(127a:1025 (rev 01)) modem and preemption enabled.


Converted task queues to workqueues.

Since workqueues handle running of the queued task/work, the mdmthrd
function is not necessary (I think??) -- ie no need for

Fixes kmalloc() occasionally complaining when the GFP_KERNEL flag is
used.  Ie. OSContextAllowsSleeping() is always false -- not sure if this
is a correct fix.

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