diff options
| author | Hong Xu <hong.xu@atmel.com> | 2011-03-31 12:33:15 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-04-01 16:25:24 +0200 |
| commit | 80b4f81a49809774f1b123c456fb179e472dbd0e (patch) | |
| tree | 397325b8cdcd269109d65063853cdd77b989ff10 /drivers | |
| parent | mtd: atmel_nand: modify test case for using DMA operations (diff) | |
| download | linux-80b4f81a49809774f1b123c456fb179e472dbd0e.tar.xz linux-80b4f81a49809774f1b123c456fb179e472dbd0e.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 18 |
1 files changed, 2 insertions, 16 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index e9fdbe46b247..950646aa4c4b 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -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; |