From: Jack Stone <jwjstone@fastmail.fm>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alan Stern <stern@rowland.harvard.edu>,
Oliver Neukum <oliver@neukum.org>,
Matthew Garrett <mjg@redhat.com>, Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Larry Finger <Larry.Finger@lwfinger.net>,
Chaoming Li <chaoming_li@realsil.com.cn>,
"John W. Linville" <linville@tuxdriver.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
USB list <linux-usb@vger.kernel.org>,
Linux Wireless List <linux-wireless@vger.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.
Date: Mon, 02 Jan 2012 20:55:07 +0000 [thread overview]
Message-ID: <4F0219AB.6010505@fastmail.fm> (raw)
In-Reply-To: <CA+55aFwf06vRraVqtz8_2qWjxH0V=Yj5m7mEy3XVbA7+qj5k5A@mail.gmail.com>
On 02/01/12 20:48, Linus Torvalds wrote:
> On Mon, Jan 2, 2012 at 12:41 PM, Jack Stone <jwjstone@fastmail.fm> wrote:
>>
>> What about the case where the firmware that needs to be loaded is on the
>> USB device that needs the firmware. This can be resolved at boot using
>> an initrd but at resume time we don't have that.
>
> Quite frankly, caching the firmware will just automagically fix this.
>
> I don't understand why people even bother to talk about USB ID's etc
> changing - that is totally irrelevant. We don't look up firmware by
> USB ID's anyway.
I agree. The only problem I can see is with the lifetime of the
firmware. If we have a generic USB driver that looks after (for example)
all USB disks then we do not want to add the knowedge to it for each
individual vendors firmware.
For example:
1/ Plug in device, registers as a bootstrap device
2/ Load firmware into device (and put firmware in cache)
3/ Device disconnects and reconnects with new USB id
4/ Generic driver takes over as it recognizes the new id
The problem comes with knowing when to put the firmware - how do we tell
the generic driver that that device has firmware that might need to be
freed on disconnect. I don't know enough about USB to know if we can
tell if the same device has reconnected due to firmware being loaded or
if it was simply unplugged and a new device plugged in.
Hope this makes sense,
Jack
next prev parent reply other threads:[~2012-01-02 20:55 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-30 23:54 loading firmware while usermodehelper disabled Dave Jones
2011-12-31 0:22 ` Linus Torvalds
2011-12-31 0:40 ` Matthew Garrett
2011-12-31 15:33 ` Alan Stern
2011-12-31 15:59 ` Oliver Neukum
2012-01-01 2:21 ` Alan Stern
2012-01-01 12:22 ` Oliver Neukum
2012-01-01 16:17 ` Alan Stern
2012-01-01 16:25 ` Michael Büsch
2012-01-01 20:30 ` Linus Torvalds
2012-01-01 21:27 ` Oliver Neukum
2012-01-01 21:39 ` Michael Büsch
2012-01-02 3:33 ` Matthew Garrett
2012-01-02 7:56 ` Oliver Neukum
2012-01-02 4:17 ` Marek Vasut
2012-01-02 5:35 ` Gábor Stefanik
2012-01-02 8:38 ` Marek Vasut
2012-01-02 16:54 ` Alan Stern
2012-01-02 20:41 ` Jack Stone
2012-01-02 20:48 ` Linus Torvalds
2012-01-02 20:55 ` Jack Stone [this message]
2012-01-02 21:00 ` Linus Torvalds
2012-01-02 21:09 ` Jack Stone
2012-01-02 21:23 ` Linus Torvalds
2012-01-02 21:31 ` Jack Stone
2012-01-02 21:52 ` Marek Vasut
2012-01-02 21:57 ` Jack Stone
2012-01-02 22:31 ` Marek Vasut
2012-01-02 23:25 ` Jack Stone
2012-01-03 0:31 ` Marek Vasut
2012-01-03 0:44 ` Jack Stone
2012-01-03 0:58 ` Alan Cox
2012-01-03 7:17 ` Marek Vasut
2012-01-03 7:41 ` Oliver Neukum
2012-01-03 0:35 ` Alan Cox
2012-01-03 0:50 ` Alan Cox
2012-01-02 21:19 ` Matthew Garrett
2012-01-02 21:26 ` Jack Stone
2012-01-03 0:42 ` Alan Cox
2012-01-03 11:57 ` Oliver Neukum
2012-01-03 12:19 ` Jack Stone
2012-01-03 13:20 ` Alan Cox
2012-01-03 13:30 ` Oliver Neukum
2012-01-03 13:36 ` Alan Cox
2012-01-02 21:27 ` Linus Torvalds
2012-01-02 21:50 ` Matthew Garrett
2012-01-02 22:03 ` Linus Torvalds
2012-01-02 22:12 ` Matthew Garrett
2012-01-02 22:19 ` Linus Torvalds
2012-01-02 22:29 ` Matthew Garrett
2012-01-02 22:46 ` Linus Torvalds
2012-01-02 23:00 ` Matthew Garrett
2012-01-02 23:31 ` Jack Stone
2012-01-03 0:13 ` Matthew Garrett
2012-01-03 0:20 ` Alan Cox
2012-01-03 0:37 ` Matthew Garrett
2012-01-03 0:22 ` Jack Stone
2012-01-03 0:31 ` Alan Cox
2012-01-03 0:41 ` Jack Stone
2012-01-03 0:38 ` Matthew Garrett
2012-01-03 0:47 ` Alan Cox
2012-01-03 0:18 ` Alan Cox
2012-01-03 8:26 ` Ingo Molnar
2012-01-03 2:45 ` Alan Stern
2012-01-03 3:25 ` Matthew Garrett
2012-01-03 5:53 ` Linus Torvalds
2012-01-03 11:50 ` Oliver Neukum
2012-01-03 15:16 ` Alan Stern
2012-01-03 12:24 ` Matthew Garrett
2012-01-03 16:29 ` Linus Torvalds
2012-01-03 15:09 ` Alan Stern
2012-01-03 9:16 ` Alexander E. Patrakov
2012-01-03 9:16 ` Alexander E. Patrakov
2012-01-03 9:24 ` david
2012-01-03 13:43 ` Alan Cox
2012-01-03 14:12 ` Bernd Petrovitsch
2012-01-03 0:00 ` Alan Cox
2012-01-02 23:50 ` Alan Cox
2012-01-02 23:53 ` Alan Cox
2011-12-31 16:27 ` Matthew Garrett
2011-12-31 14:20 ` Martin Schleier
2011-12-31 18:39 ` Marek Vasut
2012-01-01 9:48 ` Oliver Neukum
2012-01-01 9:54 ` Marek Vasut
2012-01-01 12:28 ` Oliver Neukum
2012-01-01 16:32 ` Marek Vasut
2012-01-01 17:06 ` Marek Vasut
2012-01-01 20:39 ` Alan Cox
2012-01-01 20:50 ` Michael Büsch
2012-01-02 3:24 ` Marek Vasut
2012-01-02 3:29 ` Marek Vasut
2012-01-01 3:49 ` Larry Finger
2012-01-01 22:45 ` Jack Stone
-- strict thread matches above, loose matches on Subject: below --
2011-12-31 15:01 drahemmaps
2011-12-31 19:29 ` Linus Torvalds
2011-12-31 20:15 ` Matthew Garrett
2011-12-31 20:26 ` Linus Torvalds
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F0219AB.6010505@fastmail.fm \
--to=jwjstone@fastmail.fm \
--cc=Larry.Finger@lwfinger.net \
--cc=chaoming_li@realsil.com.cn \
--cc=davej@redhat.com \
--cc=gregkh@suse.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=linville@tuxdriver.com \
--cc=mjg@redhat.com \
--cc=oliver@neukum.org \
--cc=stern@rowland.harvard.edu \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.