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mtd: atmel_nand: use CPU I/O when buffer is in vmalloc(ed) region
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>
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@ -209,22 +209,8 @@ static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len,
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int err = -EIO;
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enum dma_data_direction dir = is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
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if (buf >= high_memory) {
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struct page *pg;
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if (((size_t)buf & PAGE_MASK) !=
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((size_t)(buf + len - 1) & PAGE_MASK)) {
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dev_warn(host->dev, "Buffer not fit in one page\n");
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goto err_buf;
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}
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pg = vmalloc_to_page(buf);
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if (pg == 0) {
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dev_err(host->dev, "Failed to vmalloc_to_page\n");
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goto err_buf;
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}
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p = page_address(pg) + ((size_t)buf & ~PAGE_MASK);
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}
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if (buf >= high_memory)
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goto err_buf;
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dma_dev = host->dma_chan->device;
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