systemd/1009-cdrom_id-use-the-old-MMC-fallback.patch

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From a14f14976094650e17d39f3a7d15a1c68c93c333 Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Thu, 27 Feb 2014 11:06:37 +0100
Subject: [PATCH] cdrom_id: use the old MMC fallback
https://bugzilla.redhat.com/show_bug.cgi?id=1038015
The problem seems to be that the your virtual DVD is emulating a really
old DVD device, and doing it kind of strangely.
> dracut:# /lib/udev/cdrom_id --debug /dev/sr0
> probing: '/dev/sr0'
> INQUIRY: [IMM ][Virtual CD/DVD ][0316]
> GET CONFIGURATION failed with SK=5h/ASC=24h/ACQ=00h
So your virtual drive rejects the GET CONFIGURATION command as illegal.
Other pre-MMC2 drives that don't accept this command usually return the
error
SK=5h,ASC=20h (invalid/unsupported command code), in which case cdrom_id
tries an older method, and then ID_CDROM_MEDIA_TRACK_COUNT_DATA gets set
and all the /dev/disk/by-label (etc) links get set up.
The virtual drive returns the error SK=5h,ASC=24h (invalid field in
Command Descriptor Block), which cdrom_id doesn't handle, so it gives up
and the links never get made.
The ideal solution would be to make the IMM to emulate a device that's
less than 15 years old, but I'm not going to hold my breath waiting for
that.
So probably cdrom_id should also use the old MMC fallback when the error
is SK=5h,ASC=24h, and then all of this would work as expected.
Suggested-by:Luca Miccini <lmiccini@redhat.com>
---
src/udev/cdrom_id/cdrom_id.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git src/udev/cdrom_id/cdrom_id.c src/udev/cdrom_id/cdrom_id.c
index 93467c2..33b2bc3 100644
--- a/src/udev/cdrom_id/cdrom_id.c
+++ b/src/udev/cdrom_id/cdrom_id.c
@@ -556,7 +556,7 @@ static int cd_profiles(struct udev *udev, int fd)
if ((err != 0)) {
info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
/* handle pre-MMC2 drives which do not support GET CONFIGURATION */
- if (SK(err) == 0x5 && ASC(err) == 0x20) {
+ if (SK(err) == 0x5 && (ASC(err) == 0x20 || ASC(err) == 0x24)) {
log_debug("drive is pre-MMC2 and does not support 46h get configuration command");
log_debug("trying to work around the problem");
ret = cd_profiles_old_mmc(udev, fd);
--
1.7.9.2