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<TITLE>sane-devel: RE: Problem in sanei_scsi.c</TITLE>
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<META NAME="Author" CONTENT="Simon Munton (simon@munton.demon.co.uk)">
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<META NAME="Subject" CONTENT="RE: Problem in sanei_scsi.c">
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<H1>RE: Problem in sanei_scsi.c</H1>
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<!-- received="Tue Aug 22 14:08:28 2000" -->
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<!-- sent="Tue, 22 Aug 2000 22:17:11 +0100" -->
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<!-- name="Simon Munton" -->
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<!-- email="simon@munton.demon.co.uk" -->
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<!-- subject="RE: Problem in sanei_scsi.c" -->
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<!-- id="002b01c00c7e$6b5acfa0$7a53dec2@simon" -->
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<!-- inreplyto="Problem in sanei_scsi.c" -->
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<STRONG>From:</STRONG> Simon Munton (<A HREF="mailto:simon@munton.demon.co.uk?Subject=RE:%20Problem%20in%20sanei_scsi.c&In-Reply-To=<002b01c00c7e$6b5acfa0$7a53dec2@simon>"><EM>simon@munton.demon.co.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Aug 22 2000 - 14:17:11 PDT
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0198.html">Stens, Ralph: "AW: AHA1505 on Linux, was Re: Agfa SnapScan 1236S"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0196.html">Oliver Schwartz: "Re: SnapScan Backend"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0204.html">abel deuring: "Re: Problem in sanei_scsi.c"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0204.html">abel deuring: "Re: Problem in sanei_scsi.c"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0210.html">Thomas Haberland: "Mustek SP12000pro Problem"</A>
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<A HREF="date.html#197">[ date ]</A>
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<A HREF="author.html#197">[ author ]</A>
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</UL>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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I reported this problem back in May, and Abel Deuring applied my patch to
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<BR>
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CVS - but I've just noticed that it isn't in 1.0.3!
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<BR>
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<P>Simon Munton 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've found a problem in the issue() function in sanei_scsi.c, that results
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</EM><BR>
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<EM>> in the queue in sg filling up, and prevents any more scsi commands being
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</EM><BR>
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<EM>> issued until the device is closed.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There is a test on line 1690 which can erroneously try to reissue a scsi
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</EM><BR>
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<EM>> command:
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</EM><BR>
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<EM>> if (rp == fdp->sane_qhead && errno == EAGAIN)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> The first time through the enclosing while loop, rp == fdp->sane_qhead.
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</EM><BR>
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But
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<BR>
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<EM>> if the write() call issuing the command was successful, errno is left
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</EM><BR>
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<EM>> unchanged, and if errno happens to contain EAGAIN, then the command is
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</EM><BR>
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<EM>> issued again, and again... until the command queue in sg is full.
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</EM><BR>
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<P>Anyway, here's a diff against 1.0.3:
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<BR>
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<P>--- sanei_scsi.c.orig Sat Aug 12 15:54:15 2000
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<BR>
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+++ sanei_scsi.c Tue Aug 22 22:00:43 2000
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<BR>
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@@ -1644,6 +1644,7 @@
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<BR>
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retries = 20;
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<BR>
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while (retries)
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<BR>
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{
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<BR>
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+ errno = 0;
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<BR>
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#ifdef SG_IO
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<BR>
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if (sg_version < 30000)
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<BR>
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{
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<BR>
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<P><P><P>Regards
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<BR>
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<P>Simon Munton
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<BR>
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<P><P><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:%20Problem%20in%20sanei_scsi.c&In-Reply-To=<002b01c00c7e$6b5acfa0$7a53dec2@simon>">majordomo@mostang.com</A>
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</PRE>
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<P><!-- body="end" -->
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<HR NOSHADE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0198.html">Stens, Ralph: "AW: AHA1505 on Linux, was Re: Agfa SnapScan 1236S"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0196.html">Oliver Schwartz: "Re: SnapScan Backend"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0204.html">abel deuring: "Re: Problem in sanei_scsi.c"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0204.html">abel deuring: "Re: Problem in sanei_scsi.c"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0210.html">Thomas Haberland: "Mustek SP12000pro Problem"</A>
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<SMALL>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue Aug 22 2000 - 14:11:01 PDT</EM>
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</EM>
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