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spi: rockchip: potential NULL dereference on error 

We were calling dma_release_channel(rs->dma_tx.ch) when "rs->dma_tx.ch"
is potentially NULL.  There is actually a call to that in the unwind
code at the bottom of the function so we can just re-arrange this a bit
and remove the call.  Also there is no need to set rs->dma_tx.ch to
NULL on this error path.

Fixes: e4c0e06f94 ('spi: rockchip: fix probe deferral handling')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Dan Carpenter 2016-05-04 09:25:46 +03:00 committed by Mark Brown
parent 3d277b1779
commit 5de7ed0c98
1 changed files with 4 additions and 5 deletions
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9
drivers/spi/spi-rockchip.c
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@ -744,10 +744,8 @@ static int rockchip_spi_probe(struct platform_device *pdev)
rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
if (IS_ERR(rs->dma_rx.ch)) {
if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
dma_release_channel(rs->dma_tx.ch);
rs->dma_tx.ch = NULL;
ret = -EPROBE_DEFER;
goto err_get_fifo_len;
goto err_free_dma_tx;
}
dev_warn(rs->dev, "Failed to request RX DMA channel\n");
rs->dma_rx.ch = NULL;
@ -775,10 +773,11 @@ static int rockchip_spi_probe(struct platform_device *pdev)
err_register_master:
pm_runtime_disable(&pdev->dev);
if (rs->dma_tx.ch)
dma_release_channel(rs->dma_tx.ch);
if (rs->dma_rx.ch)
dma_release_channel(rs->dma_rx.ch);
err_free_dma_tx:
if (rs->dma_tx.ch)
dma_release_channel(rs->dma_tx.ch);
err_get_fifo_len:
clk_disable_unprepare(rs->spiclk);
err_spiclk_enable: