spi: core: make zero length transfer valid again
Zero length transfer becomes invalid since
"spi: core: Validate length of the transfers in message" commit,
but it should be valid to support an odd device, for example, which
requires long delay between chipselect and the first transfer, etc.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index d5ee965..9d14054 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1617,7 +1617,7 @@
{
struct spi_master *master = spi->master;
struct spi_transfer *xfer;
- int w_size, n_words;
+ int w_size;
if (list_empty(&message->transfers))
return -EINVAL;
@@ -1680,9 +1680,8 @@
else
w_size = 4;
- n_words = xfer->len / w_size;
/* No partial transfers accepted */
- if (!n_words || xfer->len % w_size)
+ if (xfer->len % w_size)
return -EINVAL;
if (xfer->speed_hz && master->min_speed_hz &&