dmaengine: mv_xor: Fix incorrect offset in dma_map_page()

Upon booting, I occasionally spotted some BUGs triggered by the internal
DMA test routine executed upon driver probing. This was detected by
SLUB_DEBUG ("Freechain corrupt" or "Redzone overwritten"). Tracking
this down located a problem in passing 0 as offset in dma_map_page().
As kmalloc, especially when used with SLUB_DEBUG, may return a non page
aligned address.

This patch fixes this issue by passing the correct offset in
dma_map_page().

Tested on a custom Armada XP board.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Stefan Roese 2016-06-01 12:43:32 +02:00 коммит произвёл Vinod Koul
Родитель 9295c41d77
Коммит 5156463588
1 изменённых файлов: 6 добавлений и 4 удалений

Просмотреть файл

@ -703,8 +703,9 @@ static int mv_chan_memcpy_self_test(struct mv_xor_chan *mv_chan)
goto free_resources;
}
src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src), 0,
PAGE_SIZE, DMA_TO_DEVICE);
src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src),
(size_t)src & ~PAGE_MASK, PAGE_SIZE,
DMA_TO_DEVICE);
unmap->addr[0] = src_dma;
ret = dma_mapping_error(dma_chan->device->dev, src_dma);
@ -714,8 +715,9 @@ static int mv_chan_memcpy_self_test(struct mv_xor_chan *mv_chan)
}
unmap->to_cnt = 1;
dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest), 0,
PAGE_SIZE, DMA_FROM_DEVICE);
dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest),
(size_t)dest & ~PAGE_MASK, PAGE_SIZE,
DMA_FROM_DEVICE);
unmap->addr[1] = dest_dma;
ret = dma_mapping_error(dma_chan->device->dev, dest_dma);