From: Krzysztof Kozlowski krzk@kernel.org
commit 687a2e76186dcfa42f22c14b655c3fb159839e79 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/spi/spi-sprd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/spi/spi-sprd.c +++ b/drivers/spi/spi-sprd.c @@ -563,11 +563,11 @@ static int sprd_spi_dma_request(struct s
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]); }