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>

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index ac94e546a555bd364d8b7eb1cd69b6235a9ff293..6ce1066be98b0c8004c034edeb145c5799b34ac1 100644 (file)
--- 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;
 }