spi/xilinx: Make spi_tx and spi_rx simmetric

spi_rx handles the case where the buffer is null. Nevertheless spi_tx
did not handle it, and was handled by the caller function.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index ac94e546a555..6ce1066be98b 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -116,6 +116,10 @@ static unsigned int xspi_read32_be(void __iomem *addr)
 
 static void xilinx_spi_tx(struct xilinx_spi *xspi)
 {
+        if (!xspi->tx_ptr) {
+                xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET);
+                return;
+        }
         xspi->write_fn(*(u32 *)(xspi->tx_ptr), xspi->regs + XSPI_TXD_OFFSET);
         xspi->tx_ptr += xspi->bits_per_word / 8;
 }
@@ -230,10 +234,7 @@ static void xilinx_spi_fill_tx_fifo(struct xilinx_spi *xspi, int n_words)
         xspi->remaining_bytes -= n_words * xspi->bits_per_word / 8;
 
         while (n_words--)
-                if (xspi->tx_ptr)
-                        xilinx_spi_tx(xspi);
-                else
-                        xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET);
+                xilinx_spi_tx(xspi);
         return;
 }