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author	Sage Weil <sage@newdream.net>
	Thu, 27 Aug 2009 16:14:15 +0000 (09:14 -0700)
committer	Sage Weil <sage@newdream.net>
	Thu, 27 Aug 2009 16:14:15 +0000 (09:14 -0700)
commit	66efd409dbeee84e613a2511989dc4f1f354910c
tree	d6c2f6dd4edc072323ce1b8654037396b7d530de	tree \| snapshot
parent	475dd60dcd9a8e04f2204c0b02d1268b8598633c	commit \| diff

kclient: fail con->ops->get() if ref count is zero, and avoid requeueing work

This fixes a bug where a socket status change races with con_destroy:

ref 1 -> 0
con_destroy()
sock state change, requeue
destroy socket
kfree(con)
...do work and crash...

src/TODO		diff \| blob \| history
src/kernel/mds_client.c		diff \| blob \| history
src/kernel/messenger.c		diff \| blob \| history
src/kernel/messenger.h		diff \| blob \| history

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