Re: SCSI timeout and reset on ncr53c8xx and DVD_AUTH ioctl

[Jens Axboe]

On Sat, Apr 15 2000, Gérard Roudier wrote:
> > Trying to do a DVD_AUTH ioctl I get a SCSI command timeout and after
> > that a bus reset (see below) beginning with kernel 2.3.99-pre1 through
> > -pre5 . It works without a problem in kernel 2.2.14 and 2.3.51.
> 
> What has changed in recent linux SCSI (and PCI related) is that the kernel
> allows applications to provide the data direction and requires low-level
> drivers to check that data is transferred in the right direction. The
> ncr53c8xx driver may lock up when actual data direction is wrong, but the
> sym53c8xx will gracefully eat the wrong data, throw them away, and report
> an error.

The command issues is REPORT_KEY and the data direction has been set
by the Uniform CD-ROM layer. So I don't think that is the problem.

-- 
*  Jens Axboe <[e-mail]>
*  Linux CD/DVD-ROM, SuSE Labs
*  http://kernel.dk