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

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Date:	Tue, 1 Jul 2014 11:54:24 +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] firmware loader: inform direct failure when udev loader
 is disabled

On Tue, Jul 1, 2014 at 7:30 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 without 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.
>
> [0] https://github.com/mcgrof/fake-firmware-test.git
>
> 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>
> ---
>
>  drivers/base/firmware_class.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 46ea5f4..23274d8 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -101,8 +101,10 @@ static inline long firmware_loading_timeout(void)
>  #define FW_OPT_NOWAIT  (1U << 1)
>  #ifdef CONFIG_FW_LOADER_USER_HELPER
>  #define FW_OPT_USERHELPER      (1U << 2)
> +#define FW_OPT_FAIL_WARN       0
>  #else
>  #define FW_OPT_USERHELPER      0
> +#define FW_OPT_FAIL_WARN       (1U << 3)
>  #endif
>  #ifdef CONFIG_FW_LOADER_USER_HELPER_FALLBACK
>  #define FW_OPT_FALLBACK                FW_OPT_USERHELPER
> @@ -1116,10 +1118,11 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
>
>         ret = fw_get_filesystem_firmware(device, fw->priv);
>         if (ret) {
> -               if (opt_flags & FW_OPT_USERHELPER) {
> +               if (opt_flags & (FW_OPT_FAIL_WARN | FW_OPT_USERHELPER))
>                         dev_warn(device,
> -                                "Direct firmware load failed with error %d\n",
> -                                ret);
> +                                "Direct firmware load for %s failed with error %d\n",
> +                                name, ret);

Maybe the warning can be always printed out since
(FW_OPT_FAIL_WARN | FW_OPT_USERHELPER) should be
always true.


Thanks,
--
Ming Lei
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