[sane-devel] Bug#597922: Perfection 1650 does not work with epson2 backend

[Olaf Meeuwissen]

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On 2010-12-05 01:55, Julien BLACHE wrote:
> Olaf Meeuwissen <olaf.meeuwissen at avasys.jp> wrote:
>> For some reason the device is saying that it received a cancel request
>> (did someone push a cancel button on the device?).  Protocol-wise, the
>> backend is supposed to send a CAN in that case before anything else.
> 
> Looks like one or both of
>  506c1be1a4252e9b640bd966869f8f68830d78c0
>  63a8dd4ebc9535b23d7a922cb0e7a9a682edd955
> could be at fault here.

The former doesn't seem to be at fault.
The latter only goes part of the way.  In case of an FSG_STATUS_FER or
FSG_STATUS_NOT_READY one should not request any image data anymore and
that is what the backend seems to be doing.  However, in case you get an
FSG_STATUS_CANCEL_REQ you have to send a CAN.  The backend only sets the
SANE_STATUS_CANCELLED flag and returns.  As a result e2_scan_finish gets
called but that doesn't send a CAN.

Obviously, e2_scan_finish cannot know that it should.  So I'd make
e2_ext_read send the CAN (by calling e2_cancel) before it returns
SANE_STATUS_CANCELLED.

> If someone with hardware access could look into this and report back,
> that'd be great.

I'll have a look at the logs Soren sent.
- -- 
Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
FSF Associate Member #1962               Help support software freedom
                 http://www.fsf.org/jf?referrer=1962
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