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spi: core: Validate length of the transfers in message

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SPI transfer length should be multiple of SPI word size,
where SPI word size should be power-of-two multiple

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Ivan T. Ivanov 2014-02-20 12:02:08 +02:00 committed by Mark Brown
parent aec35f4ee6
commit 4d94bd21b3
1 changed files with 17 additions and 0 deletions
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17
drivers/spi/spi.c
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@ -1617,6 +1617,7 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
{ {
struct spi_master *master = spi->master; struct spi_master *master = spi->master;
struct spi_transfer *xfer; struct spi_transfer *xfer;
int w_size, n_words;
if (list_empty(&message->transfers)) if (list_empty(&message->transfers))
return -EINVAL; return -EINVAL;
@ -1668,6 +1669,22 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
return -EINVAL; return -EINVAL;
} }
/*
* SPI transfer length should be multiple of SPI word size
* where SPI word size should be power-of-two multiple
*/
if (xfer->bits_per_word <= 8)
w_size = 1;
else if (xfer->bits_per_word <= 16)
w_size = 2;
else
w_size = 4;
n_words = xfer->len / w_size;
/* No partial transfers accepted */
if (!n_words || xfer->len % w_size)
return -EINVAL;
if (xfer->speed_hz && master->min_speed_hz && if (xfer->speed_hz && master->min_speed_hz &&
xfer->speed_hz < master->min_speed_hz) xfer->speed_hz < master->min_speed_hz)
return -EINVAL; return -EINVAL;