[sane-devel] strange SCSI behaviour

[Alessandro Zummo]

On Sat, 25 Nov 2006 15:33:16 +0100
abel deuring <adeuring at gmx.net> wrote:

> 
> Perhaps I am missing the point, but here one SCSI command finished
> with an error, and below another SCSI command is sent to the device.
>  Can't you check for the error here and decide to wait? Or handle

 I added that check. The problem was that the first command
 only returned after a couple of mins.


> the sense data in another way? Admitted, the data of the sense
> buffer is not very enlightening: UNIT ATTENTION does not tell very
> much by itself, but you know which command caused the error, and the
> documentation of the scanner may give a better clue what might have
> happened.
> 
> Calling TEST UNIT READY before a "real" command is often also a good
> way to avoid longer hangs.

 that worked! It seems calling it before the first command
 is enough. Do you think it should be called before every command?

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Turin, Italy

  http://www.towertech.it