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Commit bf2253a6 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
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cdrom: always check_disk_change() on open



cdrom_open() called check_disk_change() after the rest of open path
succeeded which leads to the following bizarre behavior.

* After media change, if the device opened without O_NONBLOCK,
  open_for_data() naturally fails with -ENOMEDIA and
  check_disk_change() is never called.  The media is known to be gone
  and the open failure makes it obvious to the userland but device
  invalidation never happens.

* But if the device is opened with O_NONBLOCK, all the checks are
  bypassed and cdrom_open() doesn't notice that the media is not there
  and check_disk_change() is called and invalidation happens.

There's nothing to be gained by avoiding calling check_disk_change()
on open failure.  Common cases end up calling check_disk_change()
anyway.  All we get is inconsistent behavior.

Fix it by moving check_disk_change() invocation to the top of
cdrom_open() so that it always gets called regardless of how the rest
of open proceeds.

Stable: 2.6.38

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Reported-by: default avatarAmit Shah <amit.shah@redhat.com>
Tested-by: default avatarAmit Shah <amit.shah@redhat.com>
Cc: stable@kernel.org
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 9fd097b1
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