Advice on an sg issue

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Greetings,

I was wondering if anyone could give me advice on something.. it's
probably a quick one for anyone (unlike myself) who actually know the
subsystem :)  I'm running into an issue using sg to issue a read data
update command to a device attached to a qlogic controller.  After the
command is issued, it hangs for 20 minutes before it comes back with
an error from the write().  This behavior only occurs with a certain
firmware version of the device, so normally I'd just say it must be a
device problem... however, the git commit which switched sg.c to use
scsi_execute_async instead of scsi_do_req seems to fix the behavior.
Does anyone know, offhand, what sort of behavior change could've
resulted from switching that api use?

Thanks,
-- 
Chris Larson - clarson at kergoth dot com
Software Engineer - MontaVista - clarson at mvista dot com
Core Developer/Architect - TSLib, BitBake, OpenEmbedded, OpenZaurus
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