RDMA/irdma: Fix sleep from invalid context BUG

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Fix sleep from invalid context BUG

Taking the qos_mutex to process RoCEv2 QP's on netdev events causes a

kernel splat.

Fix this by removing the handling for RoCEv2 in

irdma_cm_teardown_connections that uses the mutex. This handling is only

needed for iWARP to avoid having connections established while the link is

down or having connections remain functional after the IP address is

removed.

BUG: sleeping function called from invalid context at kernel/locking/mutex.

Call Trace:

kernel: dump_stack+0x66/0x90

kernel: ___might_sleep.cold.92+0x8d/0x9a

kernel: mutex_lock+0x1c/0x40

kernel: irdma_cm_teardown_connections+0x28e/0x4d0 [irdma]

kernel: ? check_preempt_curr+0x7a/0x90

kernel: ? select_idle_sibling+0x22/0x3c0

kernel: ? select_task_rq_fair+0x94c/0xc90

kernel: ? irdma_exec_cqp_cmd+0xc27/0x17c0 [irdma]

kernel: ? __wake_up_common+0x7a/0x190

kernel: irdma_if_notify+0x3cc/0x450 [irdma]

kernel: ? sched_clock_cpu+0xc/0xb0

kernel: irdma_inet6addr_event+0xc6/0x150 [irdma]