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Subject[PATCH 1/2] spi: core: Fix check for dma_map_sg() failures
Date
From: Geert Uytterhoeven <geert+renesas@glider.be>

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>
---
drivers/spi/spi.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3a3245dd64ed..3aac0e885cd9 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -617,6 +617,8 @@ 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;
--
1.9.1


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