[S390] cio: Fix reference counting for online/offline.

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The current code attempts to get an extra reference count
for online devices by doing a get_device() in ccw_device_online()
and a put_device() in ccw_device_done(). However, this
- incorrectly obtains an extra reference for disconnected
  devices becoming available again (since they are already
  online)
- needs special checks for css_init_done in order to handle
  the console device
- is not obvious and
- may incorretly drop a reference count in ccw_device_done() if
  that function is called after path verification for a device
  that just became not operational.

So let's just get the reference in ccw_device_set_online() and
drop it in ccw_device_set_offline(). (Unfortunately, we still
need the special case in io_subchannel_probe().)

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Cornelia Huck 2008-12-25 13:39:06 +01:00 • committed by Martin Schwidefsky

parent 97166f52fc

commit 9cd6742197

2 changed files with 22 additions and 12 deletions

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29

drivers/s390/cio/device.c

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5

drivers/s390/cio/device_fsm.c

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