net: qrtr: Make qrtr_port_lookup() use RCU
The important part of qrtr_port_lookup() wrt synchronization is that the function returns a reference counted struct qrtr_sock, or fail. As such we need only to ensure that an decrement of the object's refcount happens inbetween the finding of the object in the idr and qrtr_port_lookup()'s own increment of the object. By using RCU and putting a synchronization point after we remove the mapping from the idr, but before it can be released we achieve this - with the benefit of not having to hold the mutex in qrtr_port_lookup(). Signed-off-by:Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
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