linux-kernel - Re: [PATCH v2] firmware loader: inform direct failure when udev loader is disabled

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Date:	Wed, 2 Jul 2014 11:21:53 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>, Tom Gundersen <teg@...m.no>,
	Abhay Salunke <Abhay_Salunke@...l.com>,
	Stefan Roese <sr@...x.de>, Arnd Bergmann <arnd@...db.de>,
	Kay Sievers <kay@...y.org>, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH v2] firmware loader: inform direct failure when udev
 loader is disabled

On Wed, Jul 2, 2014 at 11:07 AM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> Now that the udev firmware loader is optional request_firmware()
> will not provide any information on the kernel ring buffer if
> direct firmware loading failed and udev firmware loading is disabled.
> If no information is needed request_firmware_direct() should be used
> for optional firmware, at which point drivers can take on the onus
> over informing of any failures, if udev firmware loading is disabled
> though we should at the very least provide some sort of information
> as when the udev loader was enabled by default back in the days.
>
> With this change with a simple firmware load test module [0]:
>
> Example output without FW_LOADER_USER_HELPER_FALLBACK
>
> platform fake-dev.0: Direct firmware load for fake.bin failed
> with error -2
>
> Example with FW_LOADER_USER_HELPER_FALLBACK
>
> platform fake-dev.0: Direct firmware load for fake.bin failed with error -2
> platform fake-dev.0: Falling back to user helper
>
> Without this change without FW_LOADER_USER_HELPER_FALLBACK we
> get no output logged upon failure.
>
> Cc: Tom Gundersen <teg@...m.no>
> Cc: Ming Lei <ming.lei@...onical.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Abhay Salunke <Abhay_Salunke@...l.com>
> Cc: Stefan Roese <sr@...x.de>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Kay Sievers <kay@...y.org>
> Cc: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>

Looks fine, also it is a cleanup.

Acked-by: Ming Lei <ming.lei@...onical.com>

Thanks,
--
Ming Lei
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