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ARM: dma-mapping: clean up coherent arch dma allocation

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IXP23xx added support for dma_alloc_coherent() for DMA arches with an
exception in dma_alloc_coherent().  This is a subset of what goes on
in __dma_alloc(), and there is no reason why dma_alloc_writecombine()
should not be given the same treatment (except, maybe, that IXP23xx
doesn't use it.)

We can better deal with this by moving the arch_is_coherent() test
inside __dma_alloc() and killing the code duplication.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Russell King 2009-11-19 20:58:31 +00:00
parent 88c58f3b92
commit ebd7a845fa
1 changed files with 12 additions and 19 deletions
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31
arch/arm/mm/dma-mapping.c
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@ -189,18 +189,24 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
struct page *page;
struct arm_vmregion *c;
if (!consistent_pte[0]) {
printk(KERN_ERR "%s: not initialised\n", __func__);
dump_stack();
return NULL;
}
size = PAGE_ALIGN(size);
page = __dma_alloc_buffer(dev, size, gfp);
if (!page)
goto no_page;
if (arch_is_coherent()) {
*handle = page_to_dma(dev, page);
return page_address(page);
}
if (!consistent_pte[0]) {
printk(KERN_ERR "%s: not initialised\n", __func__);
dump_stack();
__dma_free_buffer(page, size);
return NULL;
}
/*
* Allocate a virtual address in the consistent mapping region.
*/
@ -342,19 +348,6 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gf
if (dma_alloc_from_coherent(dev, size, handle, &memory))
return memory;
if (arch_is_coherent()) {
struct page *page;
page = __dma_alloc_buffer(dev, PAGE_ALIGN(size), gfp);
if (!page) {
*handle = ~0;
return NULL;
}
*handle = page_to_dma(dev, page);
return page_address(page);
}
return __dma_alloc(dev, size, handle, gfp,
pgprot_noncached(pgprot_kernel));
}