Subject: USB Storage "delay" when using udev
From: Mathieu Fluhr <mfluhr@nero.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Matthias Kiefer <mkiefer@nero.com>
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Organization: Ahead Software AG.
Date: Fri, 07 Jan 2005 13:31:04 +0100
Message-Id: <1105101064.1051.7.camel@c-l-175>
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Hello

I don't know if someone has already fix this, but in the 2.6.x kernels,
when using udev file system, you encouter some kind of delay (something
like 2 or 3 seconds) when you plug in a USB hotplug device (like CD
recorder, or whatever...). 

I explain :

Normally, when you plug in such a device, the usb-storage module creates
a SCSI Generic device connected to your device for using it and adds it
to the /proc/scsi/scsi file.

With udev, it seems (I say it seems because I did not check the kernel
source yet) that the kernel is adding the SCSI Generic device in
the /proc file 2-3 seconds BEFORE this device gets useable (tested with
sg_scan).

Is it "normal" ?

Best Regards,
Mathieu


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