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mtd: atmel_nand: use CPU I/O when buffer is in vmalloc(ed) region

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The previous way of dealing with vmalloc(ed) region by walking
though the pages can not work well actually. We just fall back
to CPU I/O when the buffer address is higher than `high_memory'.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Hong Xu <hong.xu@atmel.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Hong Xu 2011-03-31 18:33:15 +08:00 committed by Artem Bityutskiy
parent 9d51567e47
commit 80b4f81a49
1 changed files with 2 additions and 16 deletions
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18
drivers/mtd/nand/atmel_nand.c
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@ -209,22 +209,8 @@ static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len,
int err = -EIO;
enum dma_data_direction dir = is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (buf >= high_memory) {
struct page *pg;
if (((size_t)buf & PAGE_MASK) !=
((size_t)(buf + len - 1) & PAGE_MASK)) {
dev_warn(host->dev, "Buffer not fit in one page\n");
goto err_buf;
}
pg = vmalloc_to_page(buf);
if (pg == 0) {
dev_err(host->dev, "Failed to vmalloc_to_page\n");
goto err_buf;
}
p = page_address(pg) + ((size_t)buf & ~PAGE_MASK);
}
if (buf >= high_memory)
goto err_buf;
dma_dev = host->dma_chan->device;