FAQ?: 10 sec delay /dev/sda1 via usb-storage using udev 43 & 2.6.8.1-10mdk

FAQ?: 10 sec delay /dev/sda1 via usb-storage using udev 43 & 2.6.8.1-10mdk

[Jayant Roplekar]

I have Googled on this enough but only found devfs vs. udev flame wars. The 
mailing list search
didn't show a clear solution to me so I am not sure if there is really one 
at this point.  I hope I did
not miss something trivial and not looking for an answer at wrong place.

Problem at hand:  I use  /sbin/hotplug -> /etc/hotplug/usb/myfuji_script  
which gets called when a fujifilm camera gets added to usb port. The delay 
between connecting the camera (also seeing the scsi emulation stuff in 
syslog, which was instantaneous)  and having a /dev/sda1  available to 
actually mount became a painful 10-12 sec as I moved to 2.6.8 on mdk 10.1.  
And I had to hard code a delay [which I guessed] in my script. Then I got a 
little wiser and added a udev symlink /dev/camera and I poll for it to 
appear inside  myfuji_script.  The delay is still close to 10 sec.  And  if 
I am not mistaken, I think even with the second (udev) solution I got a 
bogus fat partition or similar error [got that error 1 out of 5 times I have 
plugged in the camera so far].

Question: Is there an elegant solution  to reduce the delay and ensure 
smooth operation?

Please  let me know if  I have described the issue incompletely. Thanks for 
your help.

JR




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Re: FAQ?: 10 sec delay /dev/sda1 via usb-storage using udev 43 &

[Kay Sievers]

On Tue, 2005-01-11 at 17:06 +0000, Jayant Roplekar wrote:
> Problem at hand:  I use  /sbin/hotplug -> /etc/hotplug/usb/myfuji_script  
> which gets called when a fujifilm camera gets added to usb port.

Use a udev dev.d/ script instead. It is called at node creation time.

> The delay 
> between connecting the camera (also seeing the scsi emulation stuff in 
> syslog, which was instantaneous)  and having a /dev/sda1  available to 
> actually mount became a painful 10-12 sec as I moved to 2.6.8 on mdk 10.1.

Any chance to upgrade to 2.6.10? We had a bug in the kernel, which
causes holes in the sequence numbers. This causes a 10 sec timeout in
udevd waiting for the missing events.

> And I had to hard code a delay [which I guessed] in my script. Then I got a 
> little wiser and added a udev symlink /dev/camera and I poll for it to 
> appear inside  myfuji_script.  The delay is still close to 10 sec.  And  if 
> I am not mistaken, I think even with the second (udev) solution I got a 
> bogus fat partition or similar error [got that error 1 out of 5 times I have 
> plugged in the camera so far].

That does not sound to be related to udev, but usb-storage had some
problems which seems to be solved with 2.6.10 too.

Kay



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