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<TITLE>sane-devel: 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="Problem in sanei_scsi.c">
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<H1>Problem in sanei_scsi.c</H1>
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<!-- subject="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=<000f01bfc675$1015ca40$7a53dec2@simon>"><EM>simon@munton.demon.co.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu May 25 2000 - 11:14:19 PDT
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0167.html">Douglas Gilbert: "Re: Problem in sanei_scsi.c"</A>
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Hi,
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<BR>
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<P>I've found a problem in the issue() function in sanei_scsi.c, that results
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<BR>
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in the queue in sg filling up, and prevents any more scsi commands being
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<BR>
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issued until the device is closed.
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<BR>
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<P>There is a test on line 1690 which can erroneously try to reissue a scsi
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<BR>
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command:
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<BR>
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if (rp == fdp->sane_qhead && errno == EAGAIN)
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<BR>
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<P>The first time through the enclosing while loop, rp == fdp->sane_qhead. But
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<BR>
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if the write() call issuing the command was successful, errno is left
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<BR>
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unchanged, and if errno happens to contain EAGAIN, then the command is
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<BR>
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issued again, and again... until the command queue in sg is full.
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<BR>
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<P>One solution would be to set errno to 0 at the start of the while loop:
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<BR>
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<P>$ diff -c sanei_scsi.c.orig sanei_scsi.c
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<BR>
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*** sanei_scsi.c.orig Sun Mar 05 13:45:20 2000
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<BR>
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--- sanei_scsi.c Thu May 18 19:18:44 2000
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<BR>
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***************
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<BR>
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*** 1636,1641 ****
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<BR>
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--- 1636,1642 ----
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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>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><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=<000f01bfc675$1015ca40$7a53dec2@simon>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0164.html">William (Andy) Smith: "Re: Correct Network Scanner Syntax? (a question)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0162.html">John Fremlin: "Re: Microtek ScanMaker E3 -> crashes the computer"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0167.html">Douglas Gilbert: "Re: Problem in sanei_scsi.c"</A>
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