Messages in this thread | | | From | Grant Likely <> | Subject | Re: [PATCH] spi: Ensure memory used for spi_write_then_read() is DMA safe | Date | Tue, 05 Feb 2013 14:21:28 +0000 |
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On Sun, 27 Jan 2013 14:35:04 +0800, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote: > 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>
Applied, thanks.
g.
> --- > 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 >
-- Grant Likely, B.Sc, P.Eng. Secret Lab Technologies, Ltd.
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