netdev - Re: [PATCH] net: wwan: qcom_bam_dmux: Fix missing pm_runtime

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Message-ID: <Zu1uKR6v0pI5p01R@linaro.org>
Date: Fri, 20 Sep 2024 14:44:25 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Jinjie Ruan <ruanjinjie@...wei.com>, stephan@...hold.net,
	loic.poulain@...aro.org, ryazanov.s.a@...il.com,
	johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] net: wwan: qcom_bam_dmux: Fix missing
 pm_runtime_disable()

On Fri, Sep 20, 2024 at 01:48:15PM +0300, Dmitry Baryshkov wrote:
> On Fri, Sep 20, 2024 at 06:07:11PM GMT, Jinjie Ruan wrote:
> > It's important to undo pm_runtime_use_autosuspend() with
> > pm_runtime_dont_use_autosuspend() at driver exit time.
> > 
> > But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
> > is missing in the error path for bam_dmux_probe(). So add it.
> 
> Please use devm_pm_runtime_enable(), which handles autosuspend.
> 

This would conflict with the existing cleanup in bam_dmux_remove(),
which probably needs to stay manually managed since the tear down order
is quite important there.

I think this looks reasonable, except that pm_runtime_set_suspended()
should be redundant since it's the default runtime PM state.

Thanks,
Stephan