[PATCH] clk: imx: imx8qxp-lpcg: fix runtime PM cleanup on error path

[Guangshuo Li]

imx_lpcg_parse_clks_from_dt() takes a runtime PM usage reference with
pm_runtime_get_noresume() and enables autosuspend with
pm_runtime_use_autosuspend(). The success path drops the usage
reference with pm_runtime_put_autosuspend(), but the error path only
disables runtime PM.

As a result, the reference taken by pm_runtime_get_noresume() remains
unbalanced on registration failure. The autosuspend setting is also
left enabled instead of being undone with
pm_runtime_dont_use_autosuspend().

Add pm_runtime_dont_use_autosuspend() to undo the autosuspend setting
and pm_runtime_put_noidle() to drop the usage reference on the error
path.

This issue was found by manual code inspection.

Fixes: 18cdbad40c6c ("clk: imx: clk-imx8qxp-lpcg: add runtime pm support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/clk/imx/clk-imx8qxp-lpcg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-imx8qxp-lpcg.c
index 1dae3410ee99..262645bef62d 100644
--- a/drivers/clk/imx/clk-imx8qxp-lpcg.c
+++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c
@@ -277,8 +277,9 @@ static int imx_lpcg_parse_clks_from_dt(struct platform_device *pdev,
 		if (clk_hws[idx])
 			imx_clk_lpcg_scu_unregister(clk_hws[idx]);
 	}
-
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
 
 	return ret;
 }
-- 
2.43.0