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authorDavid Brownell <david-b@pacbell.net>2007-08-10 16:10:27 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 18:03:15 -0400
commitaa24886e379d2b641c5117e178b15ce1d5d366ba (patch)
treec0934ff01f7c7a18ec5f86896735286f413cd06e /lib/swiotlb.c
parentfa007d8bebc5d812a445c48664b5bcad81f1351c (diff)
dma_free_coherent() needs irqs enabled (sigh)
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 2005, 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.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: David Miller <davem@davemloft.net> Acked-by: Russell King <rmk@arm.linux.org.uk> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib/swiotlb.c')
-rw-r--r--lib/swiotlb.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index a7381d55663a..30c1400e749e 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -497,6 +497,7 @@ void
497swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, 497swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
498 dma_addr_t dma_handle) 498 dma_addr_t dma_handle)
499{ 499{
500 WARN_ON(irqs_disabled());
500 if (!(vaddr >= (void *)io_tlb_start 501 if (!(vaddr >= (void *)io_tlb_start
501 && vaddr < (void *)io_tlb_end)) 502 && vaddr < (void *)io_tlb_end))
502 free_pages((unsigned long) vaddr, get_order(size)); 503 free_pages((unsigned long) vaddr, get_order(size));