[PATCH 5.16 180/227] dmaengine: stm32-dmamux: Fix PM disable depth imbalance in stm32_dmamux_probe

Greg Kroah-Hartman
2022-02-21T10:12:52Z

From: Miaoqian Lin <linmq006@gmail.com>

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>
---
drivers/dma/stm32-dmamux.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/dma/stm32-dmamux.c
+++ b/drivers/dma/stm32-dmamux.c
@@ -292,10 +292,12 @@ static int stm32_dmamux_probe(struct pla
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);