On Tuesday 24 July 2007, Russell King wrote:
> On Tue, Jul 24, 2007 at 02:29:05PM -0700, David Brownell wrote:
> > On at least ARM (and I'm told MIPS too) dma_free_coherent() has a newish
> > call context requirement: unlike its dma_alloc_coherent() sibling, it
> > may not be called with IRQs disabled. (This was new behavior on ARM as
> > of late 2006, caused by ARM SMP updates.)
>
> I think you got the year wrong:
>
> 5edf71ae (Russell King 2005-11-25 15:52:51 +0000 364) WARN_ON(irqs_disabled());
>
> which is due to this commit:
>
> [ARM] Do not call flush_tlb_kernel_range() with IRQs disabled.
This little "to do" list item has been sitting in my mailbox way
too long then. Certainly since it was fair to say "last year"! ;)
Of course, 2.6.23-rc1 also merges all the gadget API updates I
included to cope with this annoyance. So with any luck the issue
will now finally have been properly whupped.
> Signed-off-by: Russell King <[email protected]>
Thanks...
> > Since it looks like that restriction won't be removed, this patch changes
> > the definition of the API to include that requirement.
>
> The PCI DMA-mapping API had this restriction. For some reason, this
> restriction was not carried forward into the DMA-API. Unfortunately
> the restriction can not be removed without causing the problems
> described in the commit which introduced it.
Right, I noticed that.
- Dave
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