cxgb4: avoid enabling napi twice to the same queue
[ Upstream commit e7519f99 ] Take uld mutex to avoid race between cxgb_up() and cxgb4_register_uld() to enable napi for the same uld queue. Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
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