[PATCH] counter: ti-eqep: fix refcount leak in ti_eqep_probe()

[PATCH] counter: ti-eqep: fix refcount leak in ti_eqep_probe()

[Wentao Liang]

After a successful pm_runtime_get_sync(), ti_eqep_probe() can fail
if devm_clk_get_enabled() returns an error.  In that case the
runtime PM reference is never released, causing a refcount leak.

Fix this by adding pm_runtime_put_sync() and pm_runtime_disable()
calls before returning the error in the clock enable failure path.

The same cleanup pattern is already used when counter_add() fails,
so this change makes the error handling consistent.

Cc: stable@vger.kernel.org
Fixes: 0cf81c73e4c6 ("counter: ti-eqep: enable clock at probe")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/counter/ti-eqep.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
index d21c157e531a..84fbf500b0f8 100644
--- a/drivers/counter/ti-eqep.c
+++ b/drivers/counter/ti-eqep.c
@@ -548,8 +548,11 @@ static int ti_eqep_probe(struct platform_device *pdev)
 	pm_runtime_get_sync(dev);
 
 	clk = devm_clk_get_enabled(dev, NULL);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
+		pm_runtime_put_sync(dev);
+		pm_runtime_disable(dev);
 		return dev_err_probe(dev, PTR_ERR(clk), "failed to enable clock\n");
+	}
 
 	err = counter_add(counter);
 	if (err < 0) {
-- 
2.34.1

Re: [PATCH] counter: ti-eqep: fix refcount leak in ti_eqep_probe()

[William Breathitt Gray]

On Thu, Jun 04, 2026 at 09:40:36AM +0000, Wentao Liang wrote:
> After a successful pm_runtime_get_sync(), ti_eqep_probe() can fail
> if devm_clk_get_enabled() returns an error.  In that case the
> runtime PM reference is never released, causing a refcount leak.
> 
> Fix this by adding pm_runtime_put_sync() and pm_runtime_disable()
> calls before returning the error in the clock enable failure path.
> 
> The same cleanup pattern is already used when counter_add() fails,
> so this change makes the error handling consistent.
> 
> Cc: stable@vger.kernel.org
> Fixes: 0cf81c73e4c6 ("counter: ti-eqep: enable clock at probe")
> Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
> ---
>  drivers/counter/ti-eqep.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
> index d21c157e531a..84fbf500b0f8 100644
> --- a/drivers/counter/ti-eqep.c
> +++ b/drivers/counter/ti-eqep.c
> @@ -548,8 +548,11 @@ static int ti_eqep_probe(struct platform_device *pdev)
>  	pm_runtime_get_sync(dev);
> 
>  	clk = devm_clk_get_enabled(dev, NULL);
> -	if (IS_ERR(clk))
> +	if (IS_ERR(clk)) {
> +		pm_runtime_put_sync(dev);
> +		pm_runtime_disable(dev);
>  		return dev_err_probe(dev, PTR_ERR(clk), "failed to enable clock\n");
> +	}
> 
>  	err = counter_add(counter);
>  	if (err < 0) {
> --
> 2.34.1
> 

Hello Wentao,

This seems similar to another patch we're working on.[^1] I recommend
reviewing and commenting on that thread so we can consolidate there.

Thanks,

William Breathitt Gray

[^1]: https://lore.kernel.org/all/20260529095834.2561-1-sozdayvek@gmail.com/