From: Johannes Erdfelt <johannes@erdfelt.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: [linux-usb-devel] [PATCH] fix some hubs and hid devices at startup
Date: Mon, 11 Mar 2002 22:08:37 +0000 [thread overview]
Message-ID: <marc-linux-hotplug-101588456410451@msgid-missing> (raw)
On Mon, Mar 11, 2002, Greg KH <greg@kroah.com> wrote:
> Since the latest USB patch went in that added a proper delay to the
> hub connection sequence, a lot of people have been reporting odd
> problems with some USB hubs, keyboards, and mice. I've seen this
> problem too. It is usually fixed by just replugging the device in, but
> not all of the time.
>
> The reason seems to be that usbmodules is getting called from the
> hotplug package at the same time the hub driver is talking to the
> device. Since we don't have control endpoint locking in the kernel USB
> code yet, this messes things up :)
>
> The patch below, from Olaf Hering, seems to fix the problem. Also just
> removing the usbmodules binary seems to fix it for other people, but
> that's not really a good fix.
The hub driver doesn't talk to devices, so I'll assume you mean the hub
thread, which is actually calling the core for enumeration (setting
address, fetching descriptors, etc)
But the enumeration should be finished by the time the hotplug stuff
finishes.
In that case, nothing should be stomping over each other.
Is it that devices don't like how quickly we let the driver talk to it
after enumeration?
JE
_______________________________________________
Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
next reply other threads:[~2002-03-11 22:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-11 22:08 Johannes Erdfelt [this message]
2002-03-12 0:20 ` [linux-usb-devel] [PATCH] fix some hubs and hid devices at startup David Brownell
2002-03-12 20:27 ` Greg KH
2002-03-12 20:29 ` Greg KH
2002-03-12 22:15 ` David Brownell
2002-03-12 22:52 ` Greg KH
2002-03-13 1:52 ` David Brownell
2002-03-14 13:21 ` Olaf Hering
2002-03-15 18:28 ` Greg KH
2002-05-15 20:25 ` David Brownell
2002-05-15 20:37 ` Olaf Hering
2002-05-15 21:37 ` Johannes Erdfelt
-- strict thread matches above, loose matches on Subject: below --
2002-05-15 20:08 Olaf Hering
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=marc-linux-hotplug-101588456410451@msgid-missing \
--to=johannes@erdfelt.com \
--cc=linux-hotplug@vger.kernel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).