linux-kernel - Re: [PATCH] mtd: intel-dg: wake card on operations

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Message-ID: <aPYKfhTDF5kXulz9@ashevche-desk.local>
Date: Mon, 20 Oct 2025 13:10:06 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Alexander Usyskin <alexander.usyskin@...el.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Reuven Abliyev <reuven.abliyev@...el.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>
Subject: Re: [PATCH] mtd: intel-dg: wake card on operations

On Mon, Oct 20, 2025 at 01:09:10PM +0300, Andy Shevchenko wrote:
> On Sun, Oct 19, 2025 at 06:01:45PM +0300, Alexander Usyskin wrote:
> > Enable runtime PM in mtd driver to notify parent graphics driver
> > that whole card should be kept awake while nvm operations are
> > performed through this driver.

Ah, and perhaps a bit elaboration why graphics card needs that?

...

> > +	pm_runtime_mark_last_busy(nvm->dev);
> > +	pm_runtime_put_autosuspend(nvm->dev);
> 
> Please, drop the second (duplicate) call.

...

> > +	devm_pm_runtime_enable(device);
> 
> Please, justify why this code is good without error checking. Before doing that
> think for a moment for the cases when devm_*() might be developed in the future
> and return something interesting (if not yet).

...

> >  err:
> > +	pm_runtime_put(device);
> > +err_norpm:
> >  	kref_put(&nvm->refcnt, intel_dg_nvm_release);
> >  	return ret;
> 
> Mixing devm with non-devm usually lead to hard to catch bugs in the error paths
> / remove stages with ordering of cleaning resources up.

-- 
With Best Regards,
Andy Shevchenko