[Bug 11803] New: sr_mod: CDROM_DRIVE_STATUS ioctl causes tray to be closed

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=11803

           Summary: sr_mod: CDROM_DRIVE_STATUS ioctl causes tray to be
                    closed
           Product: SCSI Drivers
           Version: 2.5
     KernelVersion: 2.6.27-2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: martin.pitt@ubuntu.com


Latest working kernel version: 2.6.24 (maybe later)
Earliest failing kernel version: 2.6.27 (maybe earlier)
Distribution: Ubuntu 8.10
Hardware Environment:
 - standard ATAPI CD-ROM drive which works through sr_mod (e. g. PIONEER DVD-RW
DVR-212)
 - not using IDE drivers, but libata and pata (PATA_AMD in my case)
Software Environment:
 - single user mode
Problem Description:

As reported in https://launchpad.net/bugs/283316 and a couple of duplicates,
CD-ROM drives which are opened/ejected immediately close again. This is due to
hal polling the device every 2 seconds for an inserted medium for automounting.

The reason is that the CDROM_DRIVE_STATUS ioctl now causes an open CD tray to
get closed, instead of just returning CDS_TRAY_OPEN and leaving the tray alone
(as in earlier kernel releases).

Unfortunately I cannot precisely tell at which kernel version it regressed,
since the CD drive of my workstation doesn't support mechanical closing (one of
those external Dell drives).

I built a minimal upstream 2.7.27.2 vanilla kernel with just enough PATA_AMD
and SCSI stuff to boot and reproduce this. Given the reported duplicates, it is
not specific to a CD ROM drive model or architecture (I reproduced it on
x86_64, many reporters are on i386).

IANAKD, but a cursory glance at
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=drivers/scsi/sr_ioctl.c
revealed that there weren't any changes since about 2.6.24 (where it still
worked fine). So I'm afraid I'm lost where to look.

Steps to reproduce:
 - Open CD tray (CD drive must support mechanical closing)
 - perl -e 'open F, "/dev/scd0"; ioctl (F, 0x5326, 0x7fffffff);'


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