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authorSebastian Ott <sebott@linux.vnet.ibm.com>2009-06-22 12:08:21 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-22 12:08:23 +0200
commit181d95229b0931ee2ce6aad7348079cbc10e8d05 (patch)
tree9962496049dad3c4ed5695d09886d0804be51462 /tools/perf/perf.h
parente98bbaafcd1c47d30f3245517fb585f1aaaca4db (diff)
[S390] dasd: fix refcounting in dasd_change_state
To set a dasd online dasd_change_state is called twice. The first cycle will schedule initial analysis of the device, set the rc to -EAGAIN and will not touch the device state any more. The initial analysis will in turn call dasd_change_state to increase the state to the final DASD_STATE_ONLINE. If the dasd_change_state on the second thread outruns the other one both finish with the state set to DASD_STATE_ONLINE and the device refcount will be decreased by 2. Fix this by leaving dasd_change_state on rc == -EAGAIN so that the refcount will always be decreased by 1. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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