Save & restore NP_INFINITE_SELECT status when changing it internally

libnfc/chips/pn53x.c

@@ -1244,6 +1244,8 @@ pn53x_initiator_poll_target(struct nfc_device *pnd,
         break;
     }
   } else {
+    bool bInfiniteSelect = pnd->bInfiniteSelect;
+    int result = 0;
     if ((res = pn53x_set_property_bool(pnd, NP_INFINITE_SELECT, true)) < 0)
       return res;
     // FIXME It does not support DEP targets
@@ -1257,16 +1259,23 @@ pn53x_initiator_poll_target(struct nfc_device *pnd,
 
           if ((res = pn53x_initiator_select_passive_target_ext(pnd, pnmModulations[n], pbtInitiatorData, szInitiatorData, pnt, timeout_ms)) < 0) {
             if (pnd->last_error != NFC_ETIMEOUT) {
-              return pnd->last_error;
+              result = pnd->last_error;
+              goto end;
             }
           } else {
-            return res;
+            result = res;
+            goto end;
           }
         }
       }
     } while (uiPollNr == 0xff); // uiPollNr==0xff means infinite polling
     // We reach this point when each listing give no result, we simply have to return 0
-    return 0;
+end:
+    if (! bInfiniteSelect) {
+      if ((res = pn53x_set_property_bool(pnd, NP_INFINITE_SELECT, false)) < 0)
+        return res;
+    }
+    return result;
   }
   return NFC_ECHIP;
 }
@@ -1822,7 +1831,7 @@ static int pn53x_ISO14443A_MFC_is_present(struct nfc_device *pnd)
     ret = pn53x_Diagnose06(pnd);
   } else {
     // Limitation: re-select will lose authentication of already authenticated sector
-    // Limitation: NP_INFINITE_SELECT will be left as FALSE (we cannot restore as we don't know what was the original state)
+    bool bInfiniteSelect = pnd->bInfiniteSelect;
     uint8_t pbtInitiatorData[12];
     size_t szInitiatorData = 0;
     iso14443_cascade_uid(CHIP_DATA(pnd)->current_target->nti.nai.abtUid, CHIP_DATA(pnd)->current_target->nti.nai.szUidLen, pbtInitiatorData, &szInitiatorData);
@@ -1833,6 +1842,11 @@ static int pn53x_ISO14443A_MFC_is_present(struct nfc_device *pnd)
     } else if ((ret == 0) || (ret == NFC_ETIMEOUT)) {
       ret = NFC_ETGRELEASED;
     }
+    if (bInfiniteSelect) {
+      int ret2;
+      if ((ret2 = pn53x_set_property_bool(pnd, NP_INFINITE_SELECT, true)) < 0)
+        return ret2;
+    }
   }
   return ret;
 }

libnfc/nfc.c

@@ -573,6 +573,7 @@ nfc_initiator_list_passive_targets(nfc_device *pnd,
   pnd->last_error = 0;
 
   // Let the reader only try once to find a tag
+  bool bInfiniteSelect = pnd->bInfiniteSelect;
   if ((res = nfc_device_set_property_bool(pnd, NP_INFINITE_SELECT, false)) < 0) {
     return res;
   }
@@ -603,6 +604,11 @@ nfc_initiator_list_passive_targets(nfc_device *pnd,
       break;
     }
   }
+  if (bInfiniteSelect) {
+    if ((res = nfc_device_set_property_bool(pnd, NP_INFINITE_SELECT, true)) < 0) {
+      return res;
+    }
+  }
   return szTargetFound;
 }
 
@@ -684,18 +690,30 @@ nfc_initiator_poll_dep_target(struct nfc_device *pnd,
   const int period = 300;
   int remaining_time = timeout;
   int res;
+  int result = 0;
+  bool bInfiniteSelect = pnd->bInfiniteSelect;
   if ((res = nfc_device_set_property_bool(pnd, NP_INFINITE_SELECT, true)) < 0)
     return res;
   while (remaining_time > 0) {
     if ((res = nfc_initiator_select_dep_target(pnd, ndm, nbr, pndiInitiator, pnt, period)) < 0) {
-      if (res != NFC_ETIMEOUT)
+      if (res != NFC_ETIMEOUT) {
-        return res;
+        result = res;
+        goto end;
+      }
+    }
+    if (res == 1) {
+      result = res;
+      goto end;
     }
-    if (res == 1)
-      return res;
     remaining_time -= period;
   }
-  return 0;
+end:
+  if (! bInfiniteSelect) {
+    if ((res = nfc_device_set_property_bool(pnd, NP_INFINITE_SELECT, false)) < 0) {
+      return res;
+    }
+  }
+  return result;
 }
 
 /** @ingroup initiator