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<H1>sanei_scsi_cmd / snapscan / Prisa640S</H1>
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<STRONG>From:</STRONG> Christian Nassau (<A HREF="mailto:nassau@math.uni-frankfurt.de?Subject=Re:%20sanei_scsi_cmd%20/%20snapscan%20/%20Prisa640S&In-Reply-To=&lt;200101101019.LAA10500@siegel.math.uni-frankfurt.de&gt;"><EM>nassau@math.uni-frankfurt.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Wed Jan 10 2001 - 02:19:39 PST
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I'm currently trying to get an Acer ScanPrisa640S (patched atp870u
<BR>
scsi driver, kernel version 2.2.16) working with a (modified) snapscan
<BR>
backend. I had the following problem...
<BR>
<P>&nbsp;&nbsp;aborting scanimage in the middle of a scan with CRTL-C leads
<BR>
&nbsp;&nbsp;to a system lock (requiring an instant reboot).
<BR>
<P>...and have found that sanei_scsi_cmd(..) only protects the
<BR>
scsi read and write instructions individually against user
<BR>
breaks. The SCSI-Programming-FAQ (dated 1997) that I have says
<BR>
that the **pair** (write/read) has to be protected, because
<BR>
otherwise very bad things will happen... (depending on the
<BR>
kernel version)...
<BR>
<P>... so, I've created a wrapper &quot;sanei_scsi_protected_cmd(..)&quot; and
<BR>
made snapscan use this function, and -- alas! -- userbreaks are
<BR>
safe now.
<BR>
<P>Couldn't one make sanei_scsi_cmd(..) protected by default, or at
<BR>
least provide a protected alternative? (or make the Makefile decide
<BR>
which one to install, based on the kernel version?)
<BR>
<P>---------
<BR>
Christian Nassau
<BR>
<P>e-mail: <A HREF="mailto:nassau@math.uni-frankfurt.de?Subject=Re:%20sanei_scsi_cmd%20/%20snapscan%20/%20Prisa640S&In-Reply-To=&lt;200101101019.LAA10500@siegel.math.uni-frankfurt.de&gt;">nassau@math.uni-frankfurt.de</A>
<BR>
home-page: <A HREF="http://www.math.uni-frankfurt.de/~nassau">http://www.math.uni-frankfurt.de/~nassau</A>
<BR>
<P>Fachbereich Mathematik (12)
<BR>
AG 8.1, Zi.814
<BR>
Johann Wolfgang Goethe-Universit&quot;at
<BR>
Robert-Mayer-Str. 6-10
<BR>
D-60054 Frankfurt/M
<BR>
--- Germany ---
<BR>
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