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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 19:13:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 19:13:12 -0700
commitca41cc96b2813221b05af57d0355157924de5a07 (patch)
tree093d4ca55e6dc4f77c7c8486ec47e9e625e84f17 /drivers
parentMerge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi (diff)
parentMerge branch 'next-cleanup' into for-v3.7 (diff)
downloadlinux-dev-ca41cc96b2813221b05af57d0355157924de5a07.tar.xz
linux-dev-ca41cc96b2813221b05af57d0355157924de5a07.zip
Merge branch 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull CMA and DMA-mapping updates from Marek Szyprowski: "This time the pull request is rather small, because the further redesign patches were not ready on time. This pull request consists of the patches which extend ARM DMA-mapping subsystem with support for CPU coherent (ACP) DMA busses. The first client of the new version is HighBank SATA driver. The second part of the pull request includes various cleanup for both CMA common code and ARM DMA-mapping subsystem." Fix up trivial add-add conflict due to the "dma-coherent" DT property being added next to the "calxeda,port-phys" property for the Calxeda AHCI controller. * 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping: ARM: dma-mapping: Remove unsed var at arm_coherent_iommu_unmap_page ARM: highbank: add coherent DMA setup ARM: kill off arch_is_coherent ARM: add coherent iommu dma ops ARM: add coherent dma ops ARM: dma-mapping: Refrain noisy console message ARM: dma-mapping: Small logical clean up drivers: dma-contiguous: refactor dma_alloc_from_contiguous()
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/dma-contiguous.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 34d94c762a1e..9a1469474f55 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -315,6 +315,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
{
unsigned long mask, pfn, pageno, start = 0;
struct cma *cma = dev_get_cma_area(dev);
+ struct page *page = NULL;
int ret;
if (!cma || !cma->count)
@@ -336,18 +337,17 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
for (;;) {
pageno = bitmap_find_next_zero_area(cma->bitmap, cma->count,
start, count, mask);
- if (pageno >= cma->count) {
- ret = -ENOMEM;
- goto error;
- }
+ if (pageno >= cma->count)
+ break;
pfn = cma->base_pfn + pageno;
ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA);
if (ret == 0) {
bitmap_set(cma->bitmap, pageno, count);
+ page = pfn_to_page(pfn);
break;
} else if (ret != -EBUSY) {
- goto error;
+ break;
}
pr_debug("%s(): memory range at %p is busy, retrying\n",
__func__, pfn_to_page(pfn));
@@ -356,12 +356,8 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
}
mutex_unlock(&cma_mutex);
-
- pr_debug("%s(): returned %p\n", __func__, pfn_to_page(pfn));
- return pfn_to_page(pfn);
-error:
- mutex_unlock(&cma_mutex);
- return NULL;
+ pr_debug("%s(): returned %p\n", __func__, page);
+ return page;
}
/**