spi: dw: Initialize n_bytes before the memory barrier

Since n_bytes field of the DW SPI private data is also utilized by the
IRQ handler, we need to make sure it' initialization is done before the
memory barrier.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112914.26501-4-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 55afdce..dc54990 100644 (file)
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -299,6 +299,7 @@ static int dw_spi_transfer_one(struct spi_controller *master,
 
        dws->dma_mapped = 0;
        spin_lock_irqsave(&dws->buf_lock, flags);
+       dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
        dws->tx = (void *)transfer->tx_buf;
        dws->tx_end = dws->tx + transfer->len;
        dws->rx = transfer->rx_buf;
@@ -323,7 +324,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
        }
 
        transfer->effective_speed_hz = dws->max_freq / chip->clk_div;
-       dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
 
        cr0 = dws->update_cr0(master, spi, transfer);
        dw_writel(dws, DW_SPI_CTRLR0, cr0);