net: mvneta: Fix the CPU choice in mvneta_percpu_elect

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When passing to the management of multiple RX queue, the
mvneta_percpu_elect function was broken. The use of the modulo can lead
to elect the wrong cpu. For example with rxq_def=2, if the CPU 2 goes
offline and then online, we ended with the third RX queue activated in
the same time on CPU 0 and CPU2, which lead to a kernel crash.

With this fix, we don't try to get "the closer" CPU if the default CPU is
gone, now we just use CPU 0 which always be there. Thanks to this, the
code becomes more readable, easier to maintain and more predicable.

Cc: stable@vger.kernel.org
Fixes: 2dcf75e279 ("net: mvneta: Associate RX queues with each CPU")
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Gregory CLEMENT 2016-02-04 22:09:24 +01:00 • committed by David S. Miller

parent 129219e495

commit cad5d847a0

1 changed files with 9 additions and 4 deletions

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drivers/net/ethernet/marvell/mvneta.c

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