dmaengine: stm32-dmamux: Fix PM disable depth imbalance in stm32_dmamux_probe

commit e831c7aba950f3ae94002b10321279654525e5ec upstream.

The pm_runtime_enable will increase power disable depth.
If the probe fails, we should use pm_runtime_disable() to balance
pm_runtime_enable().

Fixes: 4f3ceca254e0 ("dmaengine: stm32-dmamux: Add PM Runtime support")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20220108085336.11992-1-linmq006@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
index a421643..d5d5573 100644 (file)
--- a/drivers/dma/stm32-dmamux.c
+++ b/drivers/dma/stm32-dmamux.c
@@ -292,10 +292,12 @@ static int stm32_dmamux_probe(struct platform_device *pdev)
        ret = of_dma_router_register(node, stm32_dmamux_route_allocate,
                                     &stm32_dmamux->dmarouter);
        if (ret)
-               goto err_clk;
+               goto pm_disable;
 
        return 0;
 
+pm_disable:
+       pm_runtime_disable(&pdev->dev);
 err_clk:
        clk_disable_unprepare(stm32_dmamux->clk);