linux-kernel - Re: [PATCH] drm/msm/devfreq: Fix OPP refcnt leak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <be2222e2-8fec-84f9-bbcf-bf639a1a63bd@kali.org>
Date:   Thu, 4 Nov 2021 23:32:51 -0500
From:   Steev Klimaszewski <steev@...i.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/devfreq: Fix OPP refcnt leak


On 11/4/21 5:28 PM, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> Reported-by: Douglas Anderson <dianders@...omium.org>
> Fixes: 9bc95570175a ("drm/msm: Devfreq tuning")
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>   drivers/gpu/drm/msm/msm_gpu_devfreq.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> index d32b729b4616..9bf8600b6eea 100644
> --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> @@ -20,8 +20,6 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>   	struct msm_gpu *gpu = dev_to_gpu(dev);
>   	struct dev_pm_opp *opp;
>   
> -	opp = devfreq_recommended_opp(dev, freq, flags);
> -
>   	/*
>   	 * If the GPU is idle, devfreq is not aware, so just ignore
>   	 * it's requests
> @@ -31,6 +29,8 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>   		return 0;
>   	}
>   
> +	opp = devfreq_recommended_opp(dev, freq, flags);
> +
>   	if (IS_ERR(opp))
>   		return PTR_ERR(opp);
>   

Testing this here on the Lenovo Yoga C630, and I'm starting to see in my 
dmesg output

[   36.337061] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[   36.388122] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[   36.810941] wcd934x-codec wcd934x-codec.3.auto: Port Closed RX port 
1, value 4
[   36.811914] wcd934x-codec wcd934x-codec.3.auto: Port Closed RX port 
2, value 4
[  198.794946] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  198.845698] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  502.285421] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  502.339427] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  503.361469] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  503.412757] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  503.871480] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  503.922712] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  503.974474] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  504.025501] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  505.923563] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  505.974513] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  510.313052] usb 3-1.3: USB disconnect, device number 4
[  519.677148] usb 3-1.3: new high-speed USB device number 5 using xhci-hcd
[  519.793394] usb 3-1.3: New USB device found, idVendor=5986, 
idProduct=2115, bcdDevice=54.20
[  519.793441] usb 3-1.3: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
[  519.793472] usb 3-1.3: Product: Integrated Camera
[  519.793495] usb 3-1.3: Manufacturer: SunplusIT Inc
[  519.861020] usb 3-1.3: Found UVC 1.00 device Integrated Camera 
(5986:2115)
[  519.892879] input: Integrated Camera: Integrated C as 
/devices/platform/soc@...8f8800.usb/a800000.dwc3/xhci-hcd.1.auto/usb3/3-1/3-1.3/3-1.3:1.0/input/input27
[  520.283839] devfreq 5000000.gpu: Couldn't update frequency transition 
information.
[  520.335854] devfreq 5000000.gpu: Couldn't update frequency transition 
information.


Is this intended?