rdma: Fix qemu crash when IPv6 address is used for migration
Qemu crashes when IPv6 address is specified for migration and access to any RDMA uverbs device available on the system is blocked using cgroups. Fix the crash by checking the return value of ibv_open_device routine. Signed-off-by: NMeghana Cheripady <meghana.cheripady@avagotech.com> Signed-off-by: NPadmanabh Ratnakar <padmanabh.ratnakar@avagotech.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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