linux-kernel - Re: [RFC PATCH 1/2] driver core: export driver_deferred_probe

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Message-ID: <20210818175248.GH4177@sirena.org.uk>
Date:   Wed, 18 Aug 2021 18:52:48 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org,
        "Rafael J . Wysocki" <rafael@...nel.org>, tiwai@...e.de,
        linux-kernel@...r.kernel.org, liam.r.girdwood@...ux.intel.com,
        vkoul@...nel.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC PATCH 1/2] driver core: export
 driver_deferred_probe_trigger()

On Wed, Aug 18, 2021 at 06:49:51PM +0200, Greg Kroah-Hartman wrote:
> On Wed, Aug 18, 2021 at 10:53:07AM -0500, Pierre-Louis Bossart wrote:

> > It's been that way for a very long time (2015?) for HDAudio support, see
> > sound/pci/hda/hda_bind.c. It's my understanding that it was a conscious
> > design decision to use vendor-specific modules, if available, and
> > fallback to generic modules if the first pass failed.

> If it has been this way for so long, what has caused the sudden change
> to need to export this and call this function?

The usage predates the hardware that requires firmware downloads -
that's very new.

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