# NCR53c8xx timeout change?

Raymond A. Ingles (inglesra@frc.com)
Tue, 20 Jan 1998 14:56:49 -0500 (EST)

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I downloaded kernel 2.0.33, and I've been laboring at configuring it.
Changing the SG_BIG_BUFF value to the max is easy enough, and I've done
that.

But back in 2.0.30 I also needed to patch the ncr53c8xx.c driver to make
sure that it wouldn't time out in the middle of a long scan. (I have a
Mustek IISP type which doesn't disconnect.) The sane-scsi man page still
says:

...find the line "if (np->latetime>10)"
in file ncr53c8xx.c (normally in directory
/usr/src/linux/drivers/scsi) and change the
constant 10 to, say, 60 (one minute).

However, the ncr53c8xx.c file changed somewhere between 2.0.30 and
2.0.32. It now handles timeouts a bit differently...

/*----------------------------------------------------
**
** handle ncr chip timeouts
**
** Assumption:
** We have a chance to arbitrate for the
** SCSI bus at least every 10 seconds.
**
**----------------------------------------------------
*/

t = (thistime - np->heartbeat) / HZ;

if (t<2) np->latetime=0; else np->latetime++;

It's not clear (to me, anyway) how to change this updated driver to
allow longer timeouts. Has anyone else run into this problem yet? Does
someone know how to patch this, or should I query the driver maintainer
directly?

Sincerely,

Ray Ingles (248) 377-7735 ray.ingles@fanucrobotics.com

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