From: Bertrik Sikken <bertrik@zonnet.nl>
To: linux-hotplug@vger.kernel.org
Subject: Problem hotplugging USB flashdrive (race?)
Date: Sat, 13 Dec 2003 12:58:57 +0000 [thread overview]
Message-ID: <marc-linux-hotplug-107132041630956@msgid-missing> (raw)
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
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next reply other threads:[~2003-12-13 12:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-13 12:58 Bertrik Sikken [this message]
2003-12-15 22:01 ` Problem hotplugging USB flashdrive (race?) Greg KH
2003-12-17 17:28 ` Bertrik Sikken
2003-12-17 17:47 ` Greg KH
2003-12-18 8:53 ` Oliver Neukum
2003-12-18 18:04 ` Matthew Dharm
2003-12-18 21:13 ` Greg KH
2004-01-02 13:26 ` Olaf Hering
2004-01-05 23:47 ` Olaf Hering
2004-01-07 18:29 ` Patrick Mansfield
2004-01-07 18:32 ` Olaf Hering
2004-01-07 20:01 ` Olaf Hering
2004-01-07 20:37 ` Olaf Hering
2004-02-01 22:48 ` Olaf Hering
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