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m68k: Use for_each_sg()

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This replaces the plain loop over the sglist array with for_each_sg()
macro which consists of sg_next() function calls.  Since m68k doesn't
select ARCH_HAS_SG_CHAIN, it is not necessary to use for_each_sg() in
order to loop over each sg element.  But this can help find problems
with drivers that do not properly initialize their sg tables when
CONFIG_DEBUG_SG is enabled.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-arch@vger.kernel.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Akinobu Mita 2015-05-01 15:47:22 +09:00 committed by Geert Uytterhoeven
parent 4d686b02f6
commit 1214c52548
1 changed files with 12 additions and 7 deletions
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19
arch/m68k/kernel/dma.c
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@ -120,13 +120,16 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
}
EXPORT_SYMBOL(dma_sync_single_for_device);
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction dir)
{
int i;
struct scatterlist *sg;
for (i = 0; i < nents; sg++, i++)
dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
for_each_sg(sglist, sg, nents, i) {
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
}
EXPORT_SYMBOL(dma_sync_sg_for_device);
@ -151,14 +154,16 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page,
}
EXPORT_SYMBOL(dma_map_page);
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction dir)
{
int i;
struct scatterlist *sg;
for (i = 0; i < nents; sg++, i++) {
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
return nents;
}