From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bertrik Sikken Date: Sat, 13 Dec 2003 12:58:57 +0000 Subject: Problem hotplugging USB flashdrive (race?) Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org Hi all, I'm seeing some weird messages in /var/log/messages when inserting my USB2.0 flashdrive. Apparently scsi.agent cannot determine the type of scsi device that is created by usb-storage. When I leave the stick in during boot, it works fine. Software: * Mandrake 9.2 base system with some modifications: * Kernel 2.6.0-test11 (also tried kernel 2.6.0-test11-bk8) SCSI and USB compiled as modules. * Hotplug 20030805 * udev 008 * sysfs mounted on /sys Hardware: * Canyon USB2.0 (high speed) 128 MB flashdrive, with an embedded hub. * EHCI controller (UHCI controller gives same problem) I think what happens when inserting the flash drive is this: hotplug sees the embedded hub and mass-storage device in the USB stick and loads usb-storage and SCSI modules. Then it seems that scsi.agent tries to extract a number from the file /sys/devices/<.....>/type which appears to be an empty string according to the log. When I try to cat this file manually, it exists and it results in the number 0, which correctly indicates a SCSI disk with associated module sd_mod. I can imagine that this is some kind of race condition, where the script looks too soon for the file or its contents. Is this a known problem? What kind of logging / information is required to investigate this? Kind regards, Bertrik Sikken ------------------------------------------------------- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id78&alloc_id371&op=click _______________________________________________ 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