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spi: Ensure memory used for spi_write_then_read() is DMA safe

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Use GFP_DMA in order to ensure that the memory we allocate for transfers
in spi_write_then_read() can be DMAed. On most platforms this will have
no effect.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Mark Brown
2013-01-27 14:35:04 +08:00
committed by Grant Likely
parent c88dd349b5
commit 2cd94c8a1b
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi.c
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@@ -1661,7 +1661,8 @@ int spi_write_then_read(struct spi_device *spi,
* using the pre-allocated buffer or the transfer is too large.
*/
if ((n_tx + n_rx) > SPI_BUFSIZ || !mutex_trylock(&lock)) {
local_buf = kmalloc(max((unsigned)SPI_BUFSIZ, n_tx + n_rx), GFP_KERNEL);
local_buf = kmalloc(max((unsigned)SPI_BUFSIZ, n_tx + n_rx),
GFP_KERNEL | GFP_DMA);
if (!local_buf)
return -ENOMEM;
} else {