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SubjectRe: [PATCH v2 1/3] firmware: Introduce request_firmware_direct()


On 11/11/2013 12:30 PM, Takashi Iwai wrote:
> At Mon, 11 Nov 2013 16:34:26 +0100,
> Borislav Petkov wrote:
>>
>> On Mon, Nov 11, 2013 at 04:21:16PM +0100, Takashi Iwai wrote:
>>> When CONFIG_FW_LOADER_USER_HELPER is set, request_firmware() falls
>>> back to the usermode helper for loading via udev when the direct
>>> loading fails. But the recent udev takes way too long timeout (60
>>> seconds) for non-existing firmware. This is unacceptable for the
>>> drivers like microcode loader where they load firmwares optionally,
>>> i.e. it's no error even if no requested file exists.
>>>
>>> This patch provides a new helper function, request_firmware_direct().
>>> It behaves as same as request_firmware() except for that it doesn't
>>> fall back to usermode helper but returns an error immediately if the
>>> f/w can't be loaded directly in kernel.
>>>
>>> Without CONFIG_FW_LOADER_USER_HELPER=y, request_firmware_direct() is
>>> just an alias of request_firmware(), due to obvious reason.
>>>
>>> Tested-by: Prarit Bhargava <prarit@redhat.com>
>>> Acked-by: Ming Lei <ming.lei@canonical.com>
>>> Signed-off-by: Takashi Iwai <tiwai@suse.de>
>>> ---
>>> drivers/base/firmware_class.c | 36 +++++++++++++++++++++++++++++++-----
>>> include/linux/firmware.h | 7 +++++++
>>> 2 files changed, 38 insertions(+), 5 deletions(-)
>>
>> I like it, the 60 seconds thing has been a senseless PITA for no good
>> reason. I have always wondered what might change in 60 seconds wrt to us
>> being able to load the firmware...
>>
>>> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
>>> index eb8fb94ae2c5..7f48a6ffb0df 100644
>>> --- a/drivers/base/firmware_class.c
>>> +++ b/drivers/base/firmware_class.c
>>> @@ -1061,7 +1061,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
>>> /* called from request_firmware() and request_firmware_work_func() */
>>> static int
>>> _request_firmware(const struct firmware **firmware_p, const char *name,
>>> - struct device *device, bool uevent, bool nowait)
>>> + struct device *device, bool uevent, bool nowait, bool fallback)
>>
>> Just a nitpick: three boolean args in a row starts to slowly look like a
>> function from the windoze API. Can we do:
>>
>> _request_firmware(..., unsigned long flags)
>>
>> instead and have nice bit flags for that?
>
> Sounds like a good idea. How about the patch below?
> (I used unsigned int since there shouldn't be so many different
> behaviors.)
>
>
> thanks,
>
> Takashi
>
> ===
>
> From: Takashi Iwai <tiwai@suse.de>
> Subject: [PATCH] firmware: Use bit flags instead of boolean combos
>
> More than two boolean arguments to a function are rather confusing and
> error-prone for callers. Let's make the behavior bit flags instead of
> triple combos.
>
> A nice suggestion by Borislav Petkov.
>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>

Sure -- looks good.

Acked-by: Prarit Bhargava <prarit@redhat.com>

P.


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