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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-03-09 11:20:00 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-03-09 16:33:52 +0700 |
| commit | df88e91bbfd16662f3c8dcba27ad19e9eb4ebcef (patch) | |
| tree | e33c2bf9e643e95cdf1d5793d5ff3b2d0d1c7237 /drivers/spi | |
| parent | 92e963f50fc74041b5e9e744c330dca48e04f08d (diff) | |
| download | linux-df88e91bbfd16662f3c8dcba27ad19e9eb4ebcef.tar.bz2 | |
spi: respect the maximum segment size of DMA device
The device which is actually does DMA may have a limitation of the maximum
segment size. Respect this setting when preparing scatter-gather list.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 47eff8012a77..9e6480a2e869 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -702,6 +702,7 @@ static int spi_map_buf(struct spi_master *master, struct device *dev, enum dma_data_direction dir) { const bool vmalloced_buf = is_vmalloc_addr(buf); + unsigned int max_seg_size = dma_get_max_seg_size(dev); int desc_len; int sgs; struct page *vm_page; @@ -710,10 +711,10 @@ static int spi_map_buf(struct spi_master *master, struct device *dev, int i, ret; if (vmalloced_buf) { - desc_len = PAGE_SIZE; + desc_len = min_t(int, max_seg_size, PAGE_SIZE); sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len); } else { - desc_len = master->max_dma_len; + desc_len = min_t(int, max_seg_size, master->max_dma_len); sgs = DIV_ROUND_UP(len, desc_len); } @@ -739,7 +740,6 @@ static int spi_map_buf(struct spi_master *master, struct device *dev, sg_set_buf(&sgt->sgl[i], sg_buf, min); } - buf += min; len -= min; } |