public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Benjamin Poirier <benjamin.poirier@gmail.com>
To: Alan Stern <stern@rowland.harvard.edu>, Johan Hovold <jhovold@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>, "Rafael J. Wysocki" <rjw@sisk.pl>,
	Len Brown <len.brown@intel.com>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	Arjan van de Ven <arjan@linux.intel.com>,
	linux-pm@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, Andreas Mohr <andi@lisas.de>,
	Daniel Sangorrin <daniel.sangorrin@gmail.com>,
	linux-usb@vger.kernel.org
Subject: BUG, regression. usb-serial adapter broken by PM?
Date: Mon, 29 Nov 2010 20:52:14 -0500	[thread overview]
Message-ID: <4CF458CE.2050603@gmail.com> (raw)

Hello,

Recently, my usb-serial converter has become unusable. Attempts to open
the device always fail with:
open("/dev/ttyUSB0", O_RDONLY)          = -1 EAGAIN (Resource temporarily unavailable)

The device is a:
ID 0c52:2101 Sealevel Systems, Inc. Serial Converter
and uses the ftdi_sio driver.

I've bisected this problem to
commit 1bfee5bc86fdaecc912e06080583eddab7263df2
Author: Alan Stern <stern@rowland.harvard.edu>
Date:   Sat Sep 25 23:35:00 2010 +0200

    PM / Runtime: Merge synchronous and async runtime routines

I have other usb-serial converters that use other drivers and that are
unaffected. I have noticed the problem on a x86_64 machine (.config
here: http://pastebin.ca/2006414) and can reproduce it in kvm (with usb
passthrough, .config here: http://pastebin.ca/2006416).

I'll be glad to provide more info or try patches.

Thanks,
-Ben

             reply	other threads:[~2010-11-30  1:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-30  1:52 Benjamin Poirier [this message]
2010-11-30  3:26 ` BUG, regression. usb-serial adapter broken by PM? Greg KH
2010-11-30 15:11   ` Benjamin Poirier

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=4CF458CE.2050603@gmail.com \
    --to=benjamin.poirier@gmail.com \
    --cc=andi@lisas.de \
    --cc=arjan@linux.intel.com \
    --cc=daniel.sangorrin@gmail.com \
    --cc=gregkh@suse.de \
    --cc=jhovold@gmail.com \
    --cc=len.brown@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@lists.linux-foundation.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=pavel@ucw.cz \
    --cc=rjw@sisk.pl \
    --cc=stern@rowland.harvard.edu \
    /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