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<TITLE>sane-devel: Re: Tamarack 12000C, SCSI problems</TITLE>
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<META NAME="Author" CONTENT="abel deuring (a.deuring@satzbau-gmbh.de)">
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<META NAME="Subject" CONTENT="Re: Tamarack 12000C, SCSI problems">
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<H1>Re: Tamarack 12000C, SCSI problems</H1>
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<!-- received="Sat Feb 24 05:12:11 2001" -->
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<!-- sent="Sat, 24 Feb 2001 15:34:54 +0100" -->
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<!-- name="abel deuring" -->
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<!-- subject="Re: Tamarack 12000C, SCSI problems" -->
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%20Tamarack%2012000C,%20SCSI%20problems&In-Reply-To=<3A97C68E.367E1C58@satzbau-gmbh.de>"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat Feb 24 2001 - 06:34:54 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0208.html">Henning Meier-Geinitz: "Re: always Segmentation Fault"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0206.html">Oliver Neukum: "Re: usb-scsi driver problem with SET_WINDOW?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0199.html">Florian Jenn: "Tamarack 12000C, SCSI problems"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0224.html">Florian Jenn: "Re: Tamarack 12000C, SCSI problems"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0224.html">Florian Jenn: "Re: Tamarack 12000C, SCSI problems"</A>
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<HR NOSHADE><P>
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<P>
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Florian Jenn wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi!
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I'm working with Linux, Kernel 2.2.12 and tried to get a Tamarack
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</EM><BR>
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<EM>> Artiscan 12000C SCSI-Scanner working with Sane 1.0.4.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Both scanimage (e.g. with --test) and xscanimage come up with the
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</EM><BR>
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<EM>> following error:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> scanimage: sanei_scsi.c:3707: sanei_scsi_cmd: Assertion
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</EM><BR>
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<EM>> `src_size == cmd_size' failed.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> This results from the call
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> status = sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd)+2, buf,
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</EM><BR>
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<EM>> &nbytes);
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> in line 565 of backends/tamarack.c. (That `+2' seems a bit strange to
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</EM><BR>
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<EM>> me...)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Searching the mailing list archive resulted in some mails where the
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</EM><BR>
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<EM>> sanei_scsi_cmd function was modified because of problems with command
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</EM><BR>
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<EM>> sizes and the sg driver. Yet I don't know very much about Sane
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</EM><BR>
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<EM>> internals to get a clue what exactly is wrong in my case.
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</EM><BR>
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<P>Florian,
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<BR>
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<P>Right, this '+2' is indeed strange, and right, there were problems with
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<BR>
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command length and older versions of the Linux SG driver.
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<BR>
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<P>But these problems occured for vendor specific SCSI commands for Canon
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<BR>
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scanners, while the assert failure with the tamarack backend happens for
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<BR>
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the well standardized READ command. OTOH your suspicion is correct, that
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<BR>
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the assert failure is related to the modifications I made for correct
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<BR>
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handling of vendor specific commands. Without these patches, the
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<BR>
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Tamarack backend would probably run under Linux. But the assert I
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<BR>
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introduced is exactly the same as used in Sane's SCSI layer for other
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<BR>
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operating systems.
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<BR>
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<P>Anyway, this '+2' does not make any sense: It means that two bytes of
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<BR>
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_write data_ should be sent to the scanner for the READ command, while
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<BR>
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it should return nbytes of scan data. This can't work -- a command can
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<BR>
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either write data to a device or it can read data.
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<BR>
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<P>So I'd recommend to simply omit this '+2'. Please let me know, if it
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<BR>
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works.
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<BR>
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<P>Abel
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Tamarack%2012000C,%20SCSI%20problems&In-Reply-To=<3A97C68E.367E1C58@satzbau-gmbh.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0208.html">Henning Meier-Geinitz: "Re: always Segmentation Fault"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0206.html">Oliver Neukum: "Re: usb-scsi driver problem with SET_WINDOW?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0199.html">Florian Jenn: "Tamarack 12000C, SCSI problems"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0224.html">Florian Jenn: "Re: Tamarack 12000C, SCSI problems"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0224.html">Florian Jenn: "Re: Tamarack 12000C, SCSI problems"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sat Feb 24 2001 - 05:15:06 PST</EM>
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