* [PATCH v2] PM / devfreq: Fix handling dev_pm_qos_remove_request result
@ 2020-03-12 15:36 ` Leonard Crestez
2020-03-16 6:09 ` Chanwoo Choi
0 siblings, 1 reply; 2+ messages in thread
From: Leonard Crestez @ 2020-03-12 15:36 UTC (permalink / raw)
To: Chanwoo Choi, dAN cARPENTER
Cc: mYUNGjOO hAM, Kyungmin Park, Matthias Kaehlcke, Adam Ford,
Krzysztof Kozlowski, Rafael J. Wysocki, Viresh Kumar, linux-imx,
linux-pm, linux-arm-kernel
The dev_pm_qos_remove_request function can return 1 if
"aggregated constraint value has changed" so only negative values should
be reported as errors.
Fixes: 27dbc542f651 ("PM / devfreq: Use PM QoS for sysfs min/max_freq")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Cc: stable@vger.kernel.org
---
drivers/devfreq/devfreq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Changes since v1:
* Add fixes and cc: stable, drop empty line in message.
Link to v1: https://patchwork.kernel.org/patch/11433131/
I'm not sure this meet that stable kernel standard of "real bug that
bothers people" because all this fixes is a spurious dev_warn on device
removal. But Sasha Levin's script seem to collect a lot of low-priority
fixes anyway.
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 5c481ad1cfc7..6fecd11dafdd 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -703,17 +703,17 @@ static void devfreq_dev_release(struct device *dev)
dev_warn(dev->parent,
"Failed to remove min_freq notifier: %d\n", err);
if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) {
err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req);
- if (err)
+ if (err < 0)
dev_warn(dev->parent,
"Failed to remove max_freq request: %d\n", err);
}
if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) {
err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req);
- if (err)
+ if (err < 0)
dev_warn(dev->parent,
"Failed to remove min_freq request: %d\n", err);
}
if (devfreq->profile->exit)
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] PM / devfreq: Fix handling dev_pm_qos_remove_request result
2020-03-12 15:36 ` [PATCH v2] PM / devfreq: Fix handling dev_pm_qos_remove_request result Leonard Crestez
@ 2020-03-16 6:09 ` Chanwoo Choi
0 siblings, 0 replies; 2+ messages in thread
From: Chanwoo Choi @ 2020-03-16 6:09 UTC (permalink / raw)
To: Leonard Crestez, dAN cARPENTER
Cc: mYUNGjOO hAM, Kyungmin Park, Matthias Kaehlcke, Adam Ford,
Krzysztof Kozlowski, Rafael J. Wysocki, Viresh Kumar, linux-imx,
linux-pm, linux-arm-kernel
On 3/13/20 12:36 AM, Leonard Crestez wrote:
> The dev_pm_qos_remove_request function can return 1 if
> "aggregated constraint value has changed" so only negative values should
> be reported as errors.
>
> Fixes: 27dbc542f651 ("PM / devfreq: Use PM QoS for sysfs min/max_freq")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
> Cc: stable@vger.kernel.org
> ---
> drivers/devfreq/devfreq.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> Changes since v1:
> * Add fixes and cc: stable, drop empty line in message.
> Link to v1: https://patchwork.kernel.org/patch/11433131/
>
> I'm not sure this meet that stable kernel standard of "real bug that
> bothers people" because all this fixes is a spurious dev_warn on device
> removal. But Sasha Levin's script seem to collect a lot of low-priority
> fixes anyway.
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 5c481ad1cfc7..6fecd11dafdd 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -703,17 +703,17 @@ static void devfreq_dev_release(struct device *dev)
> dev_warn(dev->parent,
> "Failed to remove min_freq notifier: %d\n", err);
>
> if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) {
> err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req);
> - if (err)
> + if (err < 0)
> dev_warn(dev->parent,
> "Failed to remove max_freq request: %d\n", err);
> }
> if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) {
> err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req);
> - if (err)
> + if (err < 0)
> dev_warn(dev->parent,
> "Failed to remove min_freq request: %d\n", err);
> }
>
> if (devfreq->profile->exit)
>
Applied it. Thanks.
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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2020-03-12 15:36 ` [PATCH v2] PM / devfreq: Fix handling dev_pm_qos_remove_request result Leonard Crestez
2020-03-16 6:09 ` Chanwoo Choi
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