Date: Wed, 26 Nov 1997 21:09:11 +0100 (MET) From: Wilko Bulte <wilko@yedi.iaf.nl> To: freebsd-scsi@freebsd.org (FreeBSD SCSI hackers) Subject: hack for slow starting CD drives Message-ID: <199711262009.VAA00344@yedi.iaf.nl>
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Below is a dirty hack that allows slow-starting SCSI cdroms to be accessed
after e.g. a disk swap without running into ENXIO/Device Not Configured
errors.
I'm not happy with it, but it seems to help. Is there any way to put a
delay in the test_ready loop? It's not nice to bomb the drive with TUR
commands IMO. Diff is based on 2.2.1R source.
Wilko
*** cd.c Wed Nov 26 21:02:56 1997
--- cd.c.orig Wed Nov 26 20:18:54 1997
***************
*** 246,252 ****
errval errcode = 0;
u_int32_t unit, part;
struct scsi_data *cd;
- int start_unit_retry_counter = 0;
unit = CDUNIT(dev);
part = PARTITION(dev);
--- 246,251 ----
***************
*** 286,314 ****
scsi_start_unit(sc_link, CD_START);
SC_DEBUG(sc_link, SDEV_DB3, ("'start' attempted "));
sc_link->flags |= SDEV_OPEN; /* unit attn errors are now errors */
-
- /* This is a hack, but Toshiba CDs tend to take ages to get
- * up to speed and report 'Not Ready' while doing so.
- * Attempts to e.g. mount during this period resulted in device not
- * configured / ENXIO.
- * There should be some sleep/delay in this loop, but how?
- * I silently assume that after 5000 tries it should be awake, or
- * it will never get ready :-)
- */
- while ((scsi_test_unit_ready(sc_link, SCSI_SILENT) != 0) &&
- (start_unit_retry_counter != 5000)) {
-
- start_unit_retry_counter++;
- }
-
- /* It really should be ready by now */
-
if (scsi_test_unit_ready(sc_link, SCSI_SILENT) != 0) {
SC_DEBUG(sc_link, SDEV_DB3, ("not ready\n"));
errcode = ENXIO;
goto bad;
}
-
SC_DEBUG(sc_link, SDEV_DB3, ("Device present\n"));
scsi_prevent(sc_link, PR_PREVENT, SCSI_SILENT);
/*
--- 285,295 ----
_ ______________________________________________________________________
| / o / / _ Bulte email: wilko @ yedi.iaf.nl http://www.tcja.nl/~wilko
|/|/ / / /( (_) Arnhem, The Netherlands - Do, or do not. There is no 'try'
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