From: "" <simon@baydel.com>
To: linux-kernel@vger.kernel.org
Date: Mon, 15 Jul 2002 09:11:34 +0100
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Subject: scsi detect and kgdb
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Sender: linux-kernel-owner@vger.kernel.org
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I have been writing a scsi module and as part of the module 
initialisation I would like to delay while waiting for a specific 
condition. I have tried to put the detect routine in a loop which 
spins on jiffies + a timeout and my hardware condition. I had all 
sorts of problems with this code and I found that module load 
locked up. I tried using barrier and schedule in this loop and found 
that schedule worked for me most of the time. 

I thought I would have a look at the code with kgdb. Firstly I noticed 
that schedule is not defined in the kgdb enabled kernel. Also even 
if I put this detect routine in a spin for a while my interrupts do not 
get serviced until after this spin and quite possibly not until the 
detect routine returns.

I would like to know the correct way to facilitate a delay in a scsi 
module detect routine, while waiting for a hardware condition which 
gets satisfied by a number of interrupts. If this condition is not met 
in a timeout period the code also continue.

I would also like to understand the kgdb kernel behaviour.

I am running a 2.4.16 kernel.


Cheers 

Simon.
__________________________

Simon Haynes - Baydel 
Phone : 44 (0) 1372 378811
Email : simon@baydel.com
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