IPoIB: Fix hang in napi_disable() if P_Key is never found
After commit fe25c561 ("IPoIB: Don't enable NAPI when it's already enabled"), if an interface is brought up but the corresponding P_Key never appears, then ipoib_stop() will hang in napi_disable(), because ipoib_open() returns before it does napi_enable(). Fix this by changing ipoib_open() to call napi_enable() even if the P_Key isn't present. Reported-by: NYossi Etigin <yosefe@Voltaire.COM> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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