Unverified Commit 8225c1c9 authored by Serge Semin's avatar Serge Semin Committed by Mark Brown
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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: default avatarSerge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112914.26501-4-Sergey.Semin@baikalelectronics.ru


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 07918df7

drivers/spi/spi-dw-core.c

+1 −1
Original line number Diff line number Diff line
@@ -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);