ibmvnic: Make CRQ interrupt tasklet wait for all capabilities crqs

After sending device capability queries and requests to the vNIC Server,
an interrupt is triggered and the responses are written to the driver's
CRQ response buffer. Since the interrupt can be triggered before all
responses are written and visible to the partition, there is a danger
that the interrupt handler or tasklet can terminate before all responses
are read, resulting in a failure to initialize the device.

To avoid this scenario, when capability commands are sent, we set
a flag that will be checked in the following interrupt tasklet that
will handle the capability responses from the server. Once all
responses have been handled, the flag is disabled; and the tasklet
is allowed to terminate.

Signed-off-by: Thomas Falcon <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ibm/ibmvnic.c

···
 		struct ibmvnic_query_ip_offload_buffer *ip_offload_buf =
 		    &adapter->ip_offload_buf;
 
+		adapter->wait_capability = false;
 		adapter->ip_offload_tok = dma_map_single(dev, ip_offload_buf,
 							 buf_sz,
 							 DMA_FROM_DEVICE);
···
 	}
 
 out:
-	if (atomic_read(&adapter->running_cap_crqs) == 0)
+	if (atomic_read(&adapter->running_cap_crqs) == 0) {
+		adapter->wait_capability = false;
 		init_sub_crqs(adapter, 0);
 		/* We're done querying the capabilities, initialize sub-crqs */
+	}
 }
 
 static void handle_control_ras_rsp(union ibmvnic_crq *crq,
···
 			ibmvnic_handle_crq(crq, adapter);
 			crq->generic.first = 0;
 		} else {
-			done = true;
+			/* remain in tasklet until all
+			 * capabilities responses are received
+			 */
+			if (!adapter->wait_capability)
+				done = true;
 		}
 	}
+	/* if capabilities CRQ's were sent in this tasklet, the following
+	 * tasklet must wait until all responses are received
+	 */
+	if (atomic_read(&adapter->running_cap_crqs) != 0)
+		adapter->wait_capability = true;
 	spin_unlock_irqrestore(&queue->lock, flags);
 }
 

drivers/net/ethernet/ibm/ibmvnic.h

···
 	int login_rsp_buf_sz;
 
 	atomic_t running_cap_crqs;
+	bool wait_capability;
 
 	struct ibmvnic_sub_crq_queue **tx_scrq;
 	struct ibmvnic_sub_crq_queue **rx_scrq;