From: Paul Fulghum <paulkf@microgate.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg KH <greg@kroah.com>, Andrew Morton <akpm@digeo.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
johannes@erdfelt.com
Subject: Re: 2.5.69 Interrupt Latency
Date: 13 May 2003 10:35:07 -0500 [thread overview]
Message-ID: <1052840106.2255.24.camel@diemos> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0305131117240.3274-100000@ida.rowland.org>
On Tue, 2003-05-13 at 10:26, Alan Stern wrote:
> Putting in a sanity check for the global suspend state will be very easy.
> But I would like to point out that this "global suspend" does not refer to
> the entire system, only the USB bus.
That is a problem then, because the delay can still
occur during normal system operation.
> I'm not sure under what
> circumstances the bus is placed in global suspend; I think it's just when
> there are no devices attached (or the last remaining device is detached).
>
> However, there have been cases on my own system where turning off the only
> USB peripheral caused the driver to bounce between suspend_hc() and
> wakeup_hc() several times without any apparent explanation -- possibly as
> a result of transient electrical signals on the bus (?). So perhaps
> moving that delay out of the ISR isn't such a bad idea.
Agreed. If this can happen on functional USB controllers
when no devices are attached, then it is a serious problem.
--
Paul Fulghum, paulkf@microgate.com
Microgate Corporation, http://www.microgate.com
next prev parent reply other threads:[~2003-05-13 15:24 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 16:12 2.5.69 Interrupt Latency Paul Fulghum
2003-05-07 19:41 ` Paul Fulghum
2003-05-07 22:28 ` Andrew Morton
2003-05-08 0:25 ` Paul Fulghum
2003-05-08 13:56 ` Paul Fulghum
2003-05-08 19:22 ` Andrew Morton
2003-05-08 19:35 ` Paul Fulghum
2003-05-08 23:20 ` Brian Gerst
2003-05-09 18:12 ` Paul Fulghum
2003-05-09 20:30 ` Paul Fulghum
2003-05-09 21:28 ` Andrew Morton
2003-05-12 13:57 ` Paul Fulghum
2003-05-12 14:06 ` Paul Fulghum
2003-05-12 16:24 ` Greg KH
2003-05-12 17:08 ` Paul Fulghum
2003-05-12 17:30 ` Greg KH
2003-05-12 17:49 ` Paul Fulghum
2003-05-12 18:01 ` Greg KH
2003-05-12 18:15 ` Paul Fulghum
2003-05-13 15:26 ` Alan Stern
2003-05-13 15:35 ` Paul Fulghum [this message]
2003-05-13 17:30 ` Greg KH
2003-05-13 13:01 ` Paul Fulghum
2003-05-13 18:09 ` Greg KH
2003-05-13 18:11 ` Greg KH
2003-05-13 21:35 ` Alan Stern
2003-05-13 21:48 ` Helge Hafting
2003-05-13 22:09 ` Alan Stern
2003-05-14 21:06 ` Paul Fulghum
2003-05-14 21:15 ` Johannes Erdfelt
2003-05-14 21:30 ` Greg KH
2003-05-14 21:45 ` Paul Fulghum
2003-05-13 20:17 ` Bill Davidsen
2003-05-13 22:39 ` Paul Fulghum
2003-05-14 20:52 ` Test Patch: " Alan Stern
2003-05-15 13:45 ` Paul Fulghum
2003-05-15 14:12 ` Paul Fulghum
2003-05-15 21:07 ` Alan Stern
2003-05-15 15:26 ` Paul Fulghum
2003-05-15 18:11 ` Alan Stern
2003-05-15 18:40 ` Paul Fulghum
2003-05-15 19:42 ` Paul Fulghum
2003-05-15 19:59 ` Paul Fulghum
2003-05-15 21:13 ` Alan Stern
2003-05-15 21:30 ` Paul Fulghum
2003-05-15 19:17 ` Paul Fulghum
2003-05-16 15:33 ` Alan Stern
2003-05-16 15:58 ` Paul Fulghum
2003-05-16 16:18 ` Paul Fulghum
2003-05-16 17:16 ` Alan Stern
2003-05-16 17:48 ` Paul Fulghum
2003-05-16 18:31 ` Paul Fulghum
2003-05-16 18:40 ` Alan Stern
2003-05-16 19:05 ` Paul Fulghum
2003-05-18 0:57 ` Andrew McGregor
2003-05-16 17:20 ` Alan Stern
2003-05-16 17:51 ` Paul Fulghum
2003-05-19 16:41 ` Alan Stern
2003-05-19 18:20 ` Paul Fulghum
2003-05-19 18:49 ` Alan Stern
2003-05-16 18:10 ` Paul Fulghum
2003-05-14 17:50 ` Paul Fulghum
2003-05-09 21:07 ` Andrew Morton
2003-05-09 21:28 ` Paul Fulghum
2003-05-08 14:47 ` Paul Fulghum
[not found] <20030507162013$0b67@gated-at.bofh.it>
[not found] ` <20030507195008$71e6@gated-at.bofh.it>
[not found] ` <20030507224009$4228@gated-at.bofh.it>
[not found] ` <20030508140022$2498@gated-at.bofh.it>
[not found] ` <20030508193016$1083@gated-at.bofh.it>
[not found] ` <20030509182012$49f0@gated-at.bofh.it>
[not found] ` <20030509204010$3c9b@gated-at.bofh.it>
2003-05-09 21:06 ` Arnd Bergmann
2003-05-09 21:25 ` Paul Fulghum
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