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[ Upstream commit 3a70dd2 ] In FIFO mode were two problems: - RX mode was never handled and - in this case the tx_buf pointer was NULL and caused an exception fix this by handling RX mode in mtk_spi_fifo_transfer Fixes: a568231 ("spi: mediatek: Add spi bus for Mediatek MT8173") Signed-off-by: Peter Hess <peter.hess@ph-home.de> Signed-off-by: Frank Wunderlich <frank-w@public-files.de> Link: https://lore.kernel.org/r/20210706121609.680534-1-linux@fw-web.de Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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