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spi: imx: fix spi resource leak with dma transfer

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In spi_imx_dma_transfer(), when desc_rx = dmaengine_prep_slave_sg()
fails, the context goes to label no_dma and then return. However,
the memory allocated for desc_tx has not been freed yet, which leads
to resource leak.

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Reviewed-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gao Pan 2016-01-18 15:44:01 +08:00 committed by Mark Brown
parent 390f0ffe92
commit ba4a3550e9
1 changed files with 5 additions and 3 deletions
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8
drivers/spi/spi-imx.c
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@ -927,7 +927,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
tx->sgl, tx->nents, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx)
goto no_dma;
goto tx_nodma;
desc_tx->callback = spi_imx_dma_tx_callback;
desc_tx->callback_param = (void *)spi_imx;
@ -939,7 +939,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
rx->sgl, rx->nents, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx)
goto no_dma;
goto rx_nodma;
desc_rx->callback = spi_imx_dma_rx_callback;
desc_rx->callback_param = (void *)spi_imx;
@ -995,7 +995,9 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
return ret;
no_dma:
rx_nodma:
dmaengine_terminate_all(master->dma_tx);
tx_nodma:
pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
dev_driver_string(&master->dev),
dev_name(&master->dev));