NFC: implicitly deactivate in nci_start_poll

When start_poll is called, and a target was implicitly activated,
we need to implicitly deactivate it.
On the other hand, when the target was activated by the user,
we should not deactivate it.

Signed-off-by: Ilan Elias <[e-mail]>
Acked-by: Lauro Ramos Venancio <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

net/nfc/nci/core.c

···
 		return -EBUSY;
 	}
 
+	if (ndev->target_active_prot) {
+		nfc_err("there is an active target");
+		return -EBUSY;
+	}
+
 	if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
-		nfc_dbg("target already active, first deactivate...");
+		nfc_dbg("target is active, implicitly deactivate...");
 
 		rc = nci_request(ndev, nci_rf_deactivate_req, 0,
 			msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));