Re: Hammerfall (hdsp) initialization problem

[Takashi Iwai <tiwai@suse.de>]

At Tue, 27 Jul 2004 18:30:15 +0200,
I wrote:
> 
> At Tue, 27 Jul 2004 12:07:06 -0400,
> Jean-Marc Valin wrote:
> > 
> > > The problem is that you have to know the PCI pointer to call
> > > dma_alloc_coherent() correctly beforehand.  Otherwise you'll get only
> > > ZONE_DMA under 16MB region.
> > 
> > Still, there must be *something* that can be done, no? What are other
> > OSs doing about that? I mean, the card manual doesn't say "if you insert
> > this card after boot, it won't work", so I don't see why ALSA
> > fundamentally couldn't support hot-plugging cards.
> 
> Of course hotplug is supported (how can you read above in such a way?)
> The question is only the memory preallocation for the cardbus device.
> 
> hdsp driver and/or memalloc.c should be changed to handle properly the
> buffer preservation after replugging.  Most likely the pci device
> pointer is changed after replug.  Can anyone check whether pci_dev
> pointer is changed at each time?

Ok, I now simplified the middle layer code for buffer allocation.
Now the HDSP buffer should be preserved during replugging and the same
buffer should be reused.

I don't attach here the patch since it's a relatively massive change.
Please check the cvs tree later after sync'ed.
(Or wait for 1.0.6-rc release, scheduled soon later)


Takashi


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