net: qrtr: Make qrtr_port_lookup() use RCU

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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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Bjorn Andersson 2020-01-13 23:57:02 -08:00 • committed by David S. Miller

parent 0a7e0d0ef0

commit f16a4b26f3

1 changed files with 6 additions and 2 deletions

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net/qrtr/qrtr.c

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