libxl: stop using aodev->device_config in libxl__device_pci_add()...

... to hold a pointer to the device.

There is already a 'pci' field in 'pci_add_state' so simply use that from
the start. This also allows the 'pci' (#3) argument to be dropped from
do_pci_add().

NOTE: This patch also changes the type of the 'pci_domid' field in
      'pci_add_state' from 'int' to 'libxl_domid' which is more appropriate
      given what the field is used for.

Signed-off-by: Paul Durrant <[email protected]>
Reviewed-by: Oleksandr Andrushchenko <[email protected]>
Acked-by: Wei Liu <[email protected]>

tools/libs/light/libxl_pci.c

@@ -1074,7 +1074,7 @@ typedef struct pci_add_state {
     libxl__ev_qmp qmp;
     libxl__ev_time timeout;
     libxl_device_pci *pci;
-    int pci_domid;
+    libxl_domid pci_domid;
 } pci_add_state;
 
 static void pci_add_qemu_trad_watch_state_cb(libxl__egc *egc,
@@ -1091,7 +1091,6 @@ static void pci_add_dm_done(libxl__egc *,
 
 static void do_pci_add(libxl__egc *egc,
                        libxl_domid domid,
-                       libxl_device_pci *pci,
                        pci_add_state *pas)
 {
     STATE_AO_GC(pas->aodev->ao);
@@ -1101,7 +1100,6 @@ static void do_pci_add(libxl__egc *egc,
     /* init pci_add_state */
     libxl__xswait_init(&pas->xswait);
     libxl__ev_qmp_init(&pas->qmp);
-    pas->pci = pci;
     pas->pci_domid = domid;
     libxl__ev_time_init(&pas->timeout);
 
@@ -1564,13 +1562,10 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t domid,
     int stubdomid = 0;
     pci_add_state *pas;
 
-    /* Store *pci to be used by callbacks */
-    aodev->device_config = pci;
-    aodev->device_type = &libxl__pci_devtype;
-
     GCNEW(pas);
     pas->aodev = aodev;
     pas->domid = domid;
+    pas->pci = pci;
     pas->starting = starting;
     pas->callback = device_pci_add_stubdom_done;
 
@@ -1624,9 +1619,10 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t domid,
         GCNEW(pci_s);
         libxl_device_pci_init(pci_s);
         libxl_device_pci_copy(CTX, pci_s, pci);
+        pas->pci = pci_s;
         pas->callback = device_pci_add_stubdom_wait;
 
-        do_pci_add(egc, stubdomid, pci_s, pas); /* must be last */
+        do_pci_add(egc, stubdomid, pas); /* must be last */
         return;
     }
 
@@ -1681,9 +1677,8 @@ static void device_pci_add_stubdom_done(libxl__egc *egc,
     int i;
 
     /* Convenience aliases */
-    libxl__ao_device *aodev = pas->aodev;
     libxl_domid domid = pas->domid;
-    libxl_device_pci *pci = aodev->device_config;
+    libxl_device_pci *pci = pas->pci;
 
     if (rc) goto out;
 
@@ -1718,7 +1713,7 @@ static void device_pci_add_stubdom_done(libxl__egc *egc,
                 pci->vdevfn = orig_vdev;
             }
             pas->callback = device_pci_add_done;
-            do_pci_add(egc, domid, pci, pas); /* must be last */
+            do_pci_add(egc, domid, pas); /* must be last */
             return;
         }
     }
@@ -1734,7 +1729,7 @@ static void device_pci_add_done(libxl__egc *egc,
     EGC_GC;
     libxl__ao_device *aodev = pas->aodev;
     libxl_domid domid = pas->domid;
-    libxl_device_pci *pci = aodev->device_config;
+    libxl_device_pci *pci = pas->pci;
 
     if (rc) {
         LOGD(ERROR, domid,