From: "Ivan T. Ivanov" <iiva...@mm-sol.com>
SPI transfer lenght should be a power-of-two multiple
of eight bits.
Signed-off-by: Ivan T. Ivanov <iiva...@mm-sol.com>
---
drivers/spi/spi.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 23756b0..474c0b0 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1619,6 +1619,7 @@ 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;
@@ -1670,6 +1671,22 @@ static int __spi_validate(struct spi_device *spi, struct
spi_message *message)
return -EINVAL;
}
+ /*
+ * Word size of the SPI transfer should be a power-of-two
+ * multiple of eight bits,
+ */
+ 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 - 1))
+ return -EINVAL;
+
if (xfer->speed_hz && master->min_speed_hz &&
xfer->speed_hz < master->min_speed_hz)
return -EINVAL;
--
1.7.9.5
--
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