linux-kernel - Re: Re: [PATCH] dmaengine: tegra210-adma: Fix runtime PM imbalance on error

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Message-ID: <1b580492.bff38.1723c27a5e8.Coremail.dinghao.liu@zju.edu.cn>
Date:   Fri, 22 May 2020 19:32:10 +0800 (GMT+08:00)
From:   dinghao.liu@....edu.cn
To:     "Jon Hunter" <jonathanh@...dia.com>
Cc:     kjlu@....edu, "Laxman Dewangan" <ldewangan@...dia.com>,
        "Vinod Koul" <vkoul@...nel.org>,
        "Dan Williams" <dan.j.williams@...el.com>,
        "Thierry Reding" <thierry.reding@...il.com>,
        dmaengine@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] dmaengine: tegra210-adma: Fix runtime PM imbalance
 on error

> 
> On 22/05/2020 11:57, dinghao.liu@....edu.cn wrote:
> >>
> >> On 22/05/2020 08:58, Dinghao Liu wrote:
> >>> pm_runtime_get_sync() increments the runtime PM usage counter even
> >>> when it returns an error code. Thus a pairing decrement is needed on
> >>> the error handling path to keep the counter balanced.
> >>>
> >>> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> >>> ---
> >>>  drivers/dma/tegra210-adma.c | 1 +
> >>>  1 file changed, 1 insertion(+)
> >>>
> >>> diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
> >>> index c4ce5dfb149b..803e1f4d5dac 100644
> >>> --- a/drivers/dma/tegra210-adma.c
> >>> +++ b/drivers/dma/tegra210-adma.c
> >>> @@ -658,6 +658,7 @@ static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
> >>>  
> >>>  	ret = pm_runtime_get_sync(tdc2dev(tdc));
> >>>  	if (ret < 0) {
> >>> +		pm_runtime_put_sync(tdc2dev(tdc));
> >>>  		free_irq(tdc->irq, tdc);
> >>>  		return ret;
> >>>  	}
> >>>
> >>
> >>
> >> There is another place in probe that needs to be fixed as well. Can you
> >> correct this while you are at it?
> >>
> >> Thanks
> >> Jon
> >>
> >> -- 
> >> nvpublic
> > 
> > Sure. I have sent a patch to fix PM imbalance in tegra_adma_probe().
> 
> 
> You should only send one patch to fix both instances as it is the same
> driver. It is impossible to figure out that two patches with the same
> $subject are different.
> 
> Jon
> 
> -- 
> nvpublic

OK. I will fix this in the next version of patch.

Regards,
Dinghao