On Thu, 22 Jul 1999, Gerard Roudier wrote:
> --------------------------------
> BRAVO!!!!!!!!!!!!!!!!!!!!!!!!!!!
> --------------------------------
To you Lance, but not to me. :(
> The test against BUS connected was kind of check for safety, but indeed
> it is not that smart. Will study the situation and let you know.
> For now, I am not sure if removing it is really safe.
This test is just stupid and must be removed.
Could you check if removing it fixes the problem?
> Your bug tracking has been kind of perfection. Obviously, if a bug has
> to be stated, it is a driver bug. But, in normal situations, no SCSI
> interrupts should happen, so it cannot be stated as a serious bug.
> If the driver recovers, then it is just usual "room for improvement",
> in my opinion. :-)
Was "much room" here.
Thanks for your help,
G�rard.
> On Thu, 22 Jul 1999, D. Lance Robinson wrote:
>
> > Gerard,
> >
> > Here is what seems to be happening.
> >
> > 1) Send Write command to device X, it disconnects.
> > 2) Issue Test Test Unit Ready command to non-existant device Y.
> > 3) This times out and goes into the interrupt service routine (isr).
> > 4) The isr reads the status bits. Somehow the chip is enabled.
> > 5) Device X reselects (before the isr is finished)
> > 6) The isr thinks it is connected because of the error.
> > 7) The isr does a reset.
> > 8) More bad things happen.
> >
> > NOTE:
> > To test this theory, I changed ncr_recover_scsi_int() with the following
> > code...
> >
> > if (scntl1 & ISCON) {
> > if (hsts==HS_SEL_TIMEOUT)
> > printk( "SEL Timeout, but host is connected!?\n");
> > goto reset_all;
> > }
> >
> > The message does get triggered.
> >
> > Any clues on how to prevent the reconnect before the error handler has
> > done its thing? Is this a chip bug? NOTE: where the printk statement
> > is, I tried to call ncr_complete() from there. That helped some, but the
> > middle scsi layer showed some timeout messages.
> >
> > <>< Lance.
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