diff options
| author | Ivan T. Ivanov <iivanov@mm-sol.com> | 2014-02-20 12:02:08 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-02-22 11:59:56 +0900 |
| commit | 4d94bd21b333c695eba97746b615e2efb30240cc (patch) | |
| tree | 597abf7c2ef1da1d45724223f852f007424731f4 /drivers/spi/spi.c | |
| parent | aec35f4ee6eefba616065547e6882c084cc7f5cb (diff) | |
spi: core: Validate length of the transfers in message
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>
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index bb660145d19..1b53eee2cbc 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1617,6 +1617,7 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) { struct spi_master *master = spi->master; struct spi_transfer *xfer; + int w_size, n_words; if (list_empty(&message->transfers)) return -EINVAL; @@ -1668,6 +1669,22 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) 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 && xfer->speed_hz < master->min_speed_hz) return -EINVAL; |