[PATCH 1/7] spi: core: Validate Tx/Rx buffers for non-zero length transfer

[Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>]

Reject transfer if both tx_buf and rx_buf are NULL for non-zero length transfer.
Add the checking in spi core so we can remove the same checking in various
drivers.

Signed-off-by: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>
---
 drivers/spi/spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 26b331d..0a29d2a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1876,6 +1876,10 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
 		if (xfer->len % w_size)
 			return -EINVAL;
 
+		/* non-zero length transfer must has tx_buf or rx_buf */
+		if (xfer->len && !xfer->tx_buf && !xfer->rx_buf)
+			return -EINVAL;
+
 		if (xfer->speed_hz && master->min_speed_hz &&
 		    xfer->speed_hz < master->min_speed_hz)
 			return -EINVAL;
-- 
1.8.3.2



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