Hi all,

I've caught deadlock inside IDE layer using IDE-CS: after accessing
to IDE disk placed in PCMCIA (CF card really), it will never probe
again after pulling it from PCMCIA/CF.

The kernel is stuck at
drivers/ide/ide.c:ide_unregister():604:

        602                 spin_unlock_irq(&ide_lock);
        603                 device_unregister(&drive->gendev);
        604                 wait_for_completion(&drive->gendev_rel_comp);
        605                 spin_lock_irq(&ide_lock);

ide_unregister() assumes that device_unregister() will call
ide-probe.c:drive_release_dev():

        1282 static void drive_release_dev (struct device *dev)
        1283 {
        ....         [...]
        1302         complete(&drive->gendev_rel_comp);
        1303 }

        1311 static void init_gendisk (ide_hwif_t *hwif)
        1312 {
        ....
        1323                 drive->gendev.release = drive_release_dev;
        ....
        1333 }

But release() function will not called because drive->gendev is still
referenced inside genhd layer.

I'm attaching two patches: the fix and the workaround. I assume that
first is a candidate to -mm, and workaround is a temporary solution.

There are two set of patches: for the Linus's git tree and for the
handhelds.org's 2.6.17-hh1 (prefixed with hh-).

Note: this is cross-posting, thus please keep To: and CC: headers, to
keep us all in sync.

Thanks,

-- Anton (irc: bd2)