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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>
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drivers/spi
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@ -299,6 +299,7 @@ static int dw_spi_transfer_one(struct spi_controller *master,
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dws->dma_mapped = 0;
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spin_lock_irqsave(&dws->buf_lock, flags);
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dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
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dws->tx = (void *)transfer->tx_buf;
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dws->tx_end = dws->tx + transfer->len;
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dws->rx = transfer->rx_buf;
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@ -323,7 +324,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
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}
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transfer->effective_speed_hz = dws->max_freq / chip->clk_div;
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dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
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cr0 = dws->update_cr0(master, spi, transfer);
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dw_writel(dws, DW_SPI_CTRLR0, cr0);
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