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' ---------------- Support your local daemons: run [Free,Net]BSD Unix ------
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