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x86: return conditional to mmu 

Just return our allocation if we don't have an mmu. For i386, where this patch
is being applied, we never have. So our goal is just to have the code to look like
x86_64's.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber Costa 2008-04-09 13:18:08 -03:00 committed by Ingo Molnar
parent aa99b16faa
commit da60cab4dd
1 changed files with 32 additions and 2 deletions
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34
arch/x86/kernel/pci-dma_32.c
View File

@ -116,12 +116,42 @@ again:
gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
goto again;
}
/* Let low level make its own zone decisions */
gfp &= ~(GFP_DMA32|GFP_DMA);
if (dma_ops->alloc_coherent)
return dma_ops->alloc_coherent(dev, size,
dma_handle, gfp);
return NULL;
}
memset(ret, 0, size);
*dma_handle = bus;
if (!mmu) {
*dma_handle = bus;
return ret;
}
}
return ret;
if (dma_ops->alloc_coherent) {
free_pages((unsigned long)ret, get_order(size));
gfp &= ~(GFP_DMA|GFP_DMA32);
return dma_ops->alloc_coherent(dev, size, dma_handle, gfp);
}
if (dma_ops->map_simple) {
*dma_handle = dma_ops->map_simple(dev, virt_to_phys(ret),
size,
PCI_DMA_BIDIRECTIONAL);
if (*dma_handle != bad_dma_address)
return ret;
}
if (panic_on_overflow)
panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n",
(unsigned long)size);
free_pages((unsigned long)ret, get_order(size));
return NULL;
}
EXPORT_SYMBOL(dma_alloc_coherent);