diff options
| author | Peter Griffin <peter.griffin@linaro.org> | 2016-06-07 19:38:34 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-06-21 18:04:59 +0200 |
| commit | 5e2fe1e7c2780651be85cbab0d065112f5fb4649 (patch) | |
| tree | 51cef13ed7cbbdff954f8a9eb9eaeb650f7be55f /drivers/dma/fsl-edma.c | |
| parent | Linux 4.7-rc1 (diff) | |
| download | linux-5e2fe1e7c2780651be85cbab0d065112f5fb4649.tar.xz linux-5e2fe1e7c2780651be85cbab0d065112f5fb4649.zip | |
dmaengine: fsl-edma: Fix clock handling error paths
Currently fsl-edma doesn't clk_disable_unprepare()
its clocks on error conditions. This patch adds a
fsl_disable_clocks helper for this, and also only
disables clocks which were enabled if encountering
an error whilst enabling clocks.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/fsl-edma.c')
| -rw-r--r-- | drivers/dma/fsl-edma.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index be2e62b87948..7208fc906ac1 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -852,6 +852,14 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma return 0; } +static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma) +{ + int i; + + for (i = 0; i < DMAMUX_NR; i++) + clk_disable_unprepare(fsl_edma->muxclk[i]); +} + static int fsl_edma_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -897,6 +905,10 @@ static int fsl_edma_probe(struct platform_device *pdev) ret = clk_prepare_enable(fsl_edma->muxclk[i]); if (ret) { + /* disable only clks which were enabled on error */ + for (; i >= 0; i--) + clk_disable_unprepare(fsl_edma->muxclk[i]); + dev_err(&pdev->dev, "DMAMUX clk block failed.\n"); return ret; } @@ -952,6 +964,7 @@ static int fsl_edma_probe(struct platform_device *pdev) ret = dma_async_device_register(&fsl_edma->dma_dev); if (ret) { dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n"); + fsl_disable_clocks(fsl_edma); return ret; } @@ -959,6 +972,7 @@ static int fsl_edma_probe(struct platform_device *pdev) if (ret) { dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n"); dma_async_device_unregister(&fsl_edma->dma_dev); + fsl_disable_clocks(fsl_edma); return ret; } @@ -972,13 +986,10 @@ static int fsl_edma_remove(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); - int i; of_dma_controller_free(np); dma_async_device_unregister(&fsl_edma->dma_dev); - - for (i = 0; i < DMAMUX_NR; i++) - clk_disable_unprepare(fsl_edma->muxclk[i]); + fsl_disable_clocks(fsl_edma); return 0; } |