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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2014-11-17 09:14:32 +0000
committerMark Brown <broonie@kernel.org>2014-11-24 18:58:08 +0000
commit9e8987acf051e48fc0e228b6f38c47a75352c58b (patch)
tree5717c3a7539baa4e4810a62f43970d0077f40b7f /drivers/spi
parent617100c2711691e07728d3201fbcfa845a7c36d5 (diff)
downloadblackbird-obmc-linux-9e8987acf051e48fc0e228b6f38c47a75352c58b.tar.gz
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spi: spi-mxs: Fix mapping from vmalloc-ed buffer to scatter list
We can only use page_address on memory that has been mapped using kmap, when the buffer passed to the SPI has been allocated by vmalloc the page has not necessarily been mapped through kmap. This means sometimes page_address will return NULL causing the pointer we pass to sg_init_one to be invalid. Currently, this issue doesn't show up on the MXS architecture as the defconfig defines CONFIG_HIGHMEM=n which means all pages are mapped. For the sake of robustness though it is best to correct the issue. As we only call page_address so that we can pass a virtual address to sg_init_one which will eventually call virt_to_page on it, fix this by calling sg_set_page directly rather then relying on the sg_init_one helper. Note this patch is only build tested as I don't have an MXS system to test on. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-mxs.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index a9e72f9d385e..06a11546a1a7 100644
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -182,7 +182,6 @@ static int mxs_spi_txrx_dma(struct mxs_spi *spi,
int min, ret;
u32 ctrl0;
struct page *vm_page;
- void *sg_buf;
struct {
u32 pio[4];
struct scatterlist sg;
@@ -232,13 +231,14 @@ static int mxs_spi_txrx_dma(struct mxs_spi *spi,
ret = -ENOMEM;
goto err_vmalloc;
}
- sg_buf = page_address(vm_page) +
- ((size_t)buf & ~PAGE_MASK);
+
+ sg_init_table(&dma_xfer[sg_count].sg, 1);
+ sg_set_page(&dma_xfer[sg_count].sg, vm_page,
+ min, offset_in_page(buf));
} else {
- sg_buf = buf;
+ sg_init_one(&dma_xfer[sg_count].sg, buf, min);
}
- sg_init_one(&dma_xfer[sg_count].sg, sg_buf, min);
ret = dma_map_sg(ssp->dev, &dma_xfer[sg_count].sg, 1,
(flags & TXRX_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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