linux-kernel - Re: Problems loading firmware using built-in drivers with kernels that use initramfs.

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Message-ID: <CA+55aFwOT3azA9pBXeJFOm5oxNhQFOKWMX7Gq9Ey8mKrrFJQAw@mail.gmail.com>
Date:	Sun, 30 Aug 2015 11:11:32 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	Ming Lei <ming.lei@...onical.com>, Takashi Iwai <tiwai@...e.de>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
	"Jie, Yang" <yang.jie@...el.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
	Tom Gundersen <teg@...m.no>, Al Viro <viro@...iv.linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kay Sievers <kay@...y.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Luis Rodriguez <mcgrof@...not-panic.com>,
	lkml <linux-kernel@...r.kernel.org>,
	yalin wang <yalin.wang2010@...il.com>,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: Problems loading firmware using built-in drivers with kernels
 that use initramfs.

On Sun, Aug 30, 2015 at 1:25 AM, Arend van Spriel <arend@...adcom.com> wrote:
> On 08/29/2015 12:38 PM, Ming Lei wrote:
>
> Does this mean a built-in driver can not get firmware from initramfs or
> built in the kernel early. Seems a bit too aggressive.

Yeah, that seems wrong. Loading firmware from initramfs is required
for some things, like disk drivers. Of course, depending on how it's
done, it's all after the SYSTEM_BOOTING phase, but ..

What we *might* do is to not allow it for the user-mode helper
fallback, but I think it's more likely that we'll just deprecate the
usermode helper fw loader entirely, so adding new error cases for it
seems pointless.

    Linus
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