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Date: Sun, 27 Jan 2013 14:35:04 +0800 From: Mark Brown <broonie@...nsource.wolfsonmicro.com> To: Grant Likely <grant.likely@...retlab.ca> Cc: linux-kernel@...r.kernel.org, spi-devel-general@...ts.sourceforge.net, Mark Brown <broonie@...nsource.wolfsonmicro.com> Subject: [PATCH] spi: Ensure memory used for spi_write_then_read() is DMA safe 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@...nsource.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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