[PATCH] dmaengine: fsl-edma: disable clks in case of failure in probe

[Alexey Khoroshilov]

fsl_edma_probe() does not disable already enabled clocks
in case of failure. The patch fixes that.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 drivers/dma/fsl-edma.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index be2e62b87948..58271302e43d 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -885,20 +885,23 @@ static int fsl_edma_probe(struct platform_device *pdev)
 
                res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
                fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res);
-               if (IS_ERR(fsl_edma->muxbase[i]))
-                       return PTR_ERR(fsl_edma->muxbase[i]);
+               if (IS_ERR(fsl_edma->muxbase[i])) {
+                       ret = PTR_ERR(fsl_edma->muxbase[i]);
+                       goto err_clk;
+               }
 
                sprintf(clkname, "dmamux%d", i);
                fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname);
                if (IS_ERR(fsl_edma->muxclk[i])) {
                        dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
-                       return PTR_ERR(fsl_edma->muxclk[i]);
+                       ret = PTR_ERR(fsl_edma->muxclk[i]);
+                       goto err_clk;
                }
 
                ret = clk_prepare_enable(fsl_edma->muxclk[i]);
                if (ret) {
                        dev_err(&pdev->dev, "DMAMUX clk block failed.\n");
-                       return ret;
+                       goto err_clk;
                }
 
        }
@@ -923,7 +926,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
        edma_writel(fsl_edma, ~0, fsl_edma->membase + EDMA_INTR);
        ret = fsl_edma_irq_init(pdev, fsl_edma);
        if (ret)
-               return ret;
+               goto err_allclk;
 
        dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
        dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
@@ -952,20 +955,28 @@ 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");
-               return ret;
+               goto err_allclk;
        }
 
        ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma);
        if (ret) {
                dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n");
-               dma_async_device_unregister(&fsl_edma->dma_dev);
-               return ret;
+               goto err_async;
        }
 
        /* enable round robin arbitration */
        edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + 
EDMA_CR);
 
        return 0;
+
+err_async:
+       dma_async_device_unregister(&fsl_edma->dma_dev);
+err_allclk:
+       i = DMAMUX_NR;
+err_clk:
+       while (--i >= 0)
+               clk_disable_unprepare(fsl_edma->muxclk[i]);
+       return ret;
 }
 
 static int fsl_edma_remove(struct platform_device *pdev)
-- 
1.9.1