spi: sprd: Release DMA channel also on probe deferral

If dma_request_chan() for TX channel fails with EPROBE_DEFER, the RX
channel would not be released and on next re-probe it would be requested
second time.

Fixes: 386119bc7be9 ("spi: sprd: spi: sprd: Add DMA mode support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Chunyan Zhang <zhang.lyra@gmail.com>
Link: https://lore.kernel.org/r/20200901152713.18629-1-krzk@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c
index 6678f1c..0443fec 100644 (file)
--- a/drivers/spi/spi-sprd.c
+++ b/drivers/spi/spi-sprd.c
@@ -563,11 +563,11 @@ static int sprd_spi_dma_request(struct sprd_spi *ss)
 
        ss->dma.dma_chan[SPRD_SPI_TX]  = dma_request_chan(ss->dev, "tx_chn");
        if (IS_ERR_OR_NULL(ss->dma.dma_chan[SPRD_SPI_TX])) {
+               dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]);
                if (PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]) == -EPROBE_DEFER)
                        return PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]);
 
                dev_err(ss->dev, "request TX DMA channel failed!\n");
-               dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]);
                return PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]);
        }