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spi: core: Fix check for dma_map_sg() failures

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According to Documentation/DMA-API.txt, dma_map_sg() returns 0 on failure.
As spi_map_buf() returns an error code, convert zero into -ENOMEM.
Keep the existing check for negative numbers just in case.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-07-10 15:29:32 +02:00 committed by Mark Brown
parent 7171511eae
commit 89e4b66a2e
1 changed files with 2 additions and 0 deletions
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drivers/spi/spi.c
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@ -619,6 +619,8 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
}
ret = dma_map_sg(dev, sgt->sgl, sgt->nents, dir);
if (!ret)
ret = -ENOMEM;
if (ret < 0) {
sg_free_table(sgt);
return ret;