RDMA/addr: Mark addr_resolve as might_sleep()

Under one path through ib_nl_fetch_ha() this calls nlmsg_new(GFP_KERNEL)
which is a sleeping call. This is a very rare path, so mark fetch_ha() and
the module external entry point that conditionally calls through to
fetch_ha() as might_sleep().

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/core/addr.c

···
 		(const void *)&dst_in6->sin6_addr;
 	sa_family_t family = dst_in->sa_family;
 
+	might_sleep();
+
 	/* If we have a gateway in IB mode then it must be an IB network */
 	if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
 		return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
···
 	} sgid, dgid;
 	struct rdma_dev_addr dev_addr = {};
 	int ret;
+
+	might_sleep();
 
 	if (rec->roce.route_resolved)
 		return 0;