Re: PROBLEM: 2.6.3 hangs when writing to scsi-dvd

[Joachim Feise <jfeise@ics.uci.edu>]

Joachim Feise wrote on 2/19/2004 11:47:

> [1.] One line summary of the problem:
> 2.6.3 hangs when writing to scsi-dvd
> 
> [2.] Full description of the problem/report:
> 
> I have a DVD drive (BTC1004) connected via an IDE-SCSI bridge to
> an Adaptec 29160 host adapter.
> With kernel 2.6.3, I experience a complete system hang whenever I try
> to record data on a DVD.
> It requires a reboot.

More info:
on the cdwrite list, somebody reported a similar problem
(http://lists.debian.org/cdwrite/2004/cdwrite-200402/msg00081.html)

His quick-n-dirty fix works for me:

--- linux-2.6.3/drivers/scsi/scsi_lib.c.orig    2004-02-17 19:57:57.000000000 -0800
+++ linux-2.6.3/drivers/scsi/scsi_lib.c 2004-02-20 13:52:46.000000000 -0800
@@ -1292,7 +1292,7 @@
         * host adapters.  A host driver can alter this mask in its
         * slave_alloc() or slave_configure() callback if necessary.
         */
-       blk_queue_dma_alignment(q, (8 - 1));
+       /* blk_queue_dma_alignment(q, (8 - 1)); */

        if (!shost->use_clustering)
                clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);

But without knowing what this particular line does, it is impossible for me
to say if commenting out the line is the right thing to do.

-Joe