linux-kernel - Re: [patch 2.6.23-rc1] dma_free_coherent() needs irqs enabled (sigh)

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Date:	Wed, 25 Jul 2007 12:46:20 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
CC:	David Brownell <david-b@...bell.net>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Russell King <rmk@....linux.org.uk>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 2.6.23-rc1] dma_free_coherent() needs irqs enabled (sigh)

For linux1394-devel:

David Brownell wrote at LKML:
> 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.)  This little surprise can be
> annoyingly driver-visible.
> 
> Since it looks like that restriction won't be removed, this patch changes
> the definition of the API to include that requirement.  Also, to help
> catch nonportable drivers, it updates the x86 and swiotlb versions to
> include the relevant warnings.  (I already observed that it trips on the
> bus_reset_tasklet of the new firewire_ohci driver.)

Also in ohci_set_config_rom().
-- 
Stefan Richter
-=====-=-=== -=== ==--=
http://arcgraph.de/sr/
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