Messages in this thread Patch in this message | | | From | Mark Brown <> | Subject | [PATCH] spi: Ensure memory used for spi_write_then_read() is DMA safe | Date | Sun, 27 Jan 2013 14:35:04 +0800 |
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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> --- drivers/spi/spi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 19ee901..14d0fba 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1656,7 +1656,8 @@ 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 { -- 1.7.10.4
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