linux-kernel - Re: [PATCH 11/9] firewire: fw-sbp2: enforce a retry of __scsi_add

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Message-Id: <200802081354.23299.jwilson@redhat.com>
Date:	Fri, 8 Feb 2008 13:54:23 -0500
From:	Jarod Wilson <jwilson@...hat.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/9] firewire: fw-sbp2: enforce a retry of __scsi_add_device if bus generation changed

On Wednesday 06 February 2008 04:09:47 pm Stefan Richter wrote:
> fw-sbp2 is unable to reconnect while performing __scsi_add_device
> because there is only a single workqueue thread context available for
> both at the moment.  This should be fixed eventually.
>
> Until then, take care that __scsi_add_device does not return success
> even though the SCSI high-level driver probing failed (sd READ_CAPACITY
> and friends) due to bus reset.  The trick to do so is to use a different
> error indicator in the command completion as long as __scsi_add_device
> did not return.
>
> An actual failure of __scsi_add_device is easy to handle, but an
> incomplete execution of __scsi_add_device with an sdev returned would
> remain undetected and leave the SBP-2 target unusable.
>
> Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
> ---
>
> Jarod, does this work like I assume and fixes your setup of two OXFW911
> based disks?

Well, it results in the dmesg spew saying "sd 6:0:0:0: [sdc] Result: 
hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK" -- i.e., 
DID_NO_CONNECT instead of DID_BUS_BUSY, but other than that, no change in 
behavior, sdc remains unusable just as before.


-- 
Jarod Wilson
jwilson@...hat.com
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