From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Dodge Date: Mon, 04 Oct 2004 19:55:31 +0000 Subject: Re: Hotplug *seems* to hang during boot] Message-Id: <20041004195531.GA20448@basmati> List-Id: References: <4161A0FF.9010509@ntlworld.com> In-Reply-To: <4161A0FF.9010509@ntlworld.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Mon, Oct 04, 2004 at 07:14:07PM +0000, Richard Wild wrote: > Some other information noticed: it seems (to me) quite likely that the > message "cardmgr[953]: no sockets found!" is related to the problem, > because when I boot the 2.4 kernel is says instead "cardmgr[80]: no > pcmcia driver in /proc/devices". cardmgr is a bit strange in how it accesses devices. Here's a quick explanation in case it's relevant to the problem. "no pcmcia driver in /proc/devices": That means just what it says. cardmgr wants the major device number for the pcmcia driver, so it reads through /proc/devices looking for it. This error message indicates that it did not find a "pcmcia" line, presumably because no driver was loaded. "no sockets found!": This indicates that it _did_ find "pcmcia" listed in /proc/devices, and it tried to access the driver. Here's where things get a bit unusual. After obtaining the major device number from /proc/devices, cardmgr uses mknod(2) to create device files of its own. It starts with minor device 0 and continues in a one-up loop until it fails. For each minor number, it creates a device file with a name of the form "cm-PID-COUNTER", opens the file, and then immediately unlinks the file while holding it open. There are a number of directories where it might try to do this, usually in this order: /var/lib/pcmcia, /var/run, /dev, /tmp The "no sockets found" message indicates that it managed to do the mknod for minor device 0, but got an ENODEV when it then tried to open the resulting file. So what this seems to be saying is that: - your 2.4 kernel has no PCMCIA stuff loaded at all. - your 2.6 kernel has at least the "ds" driver, which creates the "pcmcia" /proc/devices entry, but it has no card sockets. I don't know if this is part of your problem or not, but since cardmgr does do some device file manipulation, it might be worth investigating. -Dave Dodge ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl _______________________________________________ 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