linux-kernel - [PATCH 5.15 186/196] dmaengine: stm32-dmamux: Fix PM disable depth imbalance in stm32_dmamux

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Message-Id: <20220221084937.164932483@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:50:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.15 186/196] dmaengine: stm32-dmamux: Fix PM disable depth imbalance in stm32_dmamux_probe

From: Miaoqian Lin <linmq006@...il.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@...il.com>
Reviewed-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
Link: https://lore.kernel.org/r/20220108085336.11992-1-linmq006@gmail.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);