libxl: use COMPARE_PCI() macro is_pci_in_array()...

... rather than an open-coded equivalent.

This patch tidies up the is_pci_in_array() function, making it take a single
'libxl_device_pci' argument rather than separate domain, bus, device and
function arguments. The already-available COMPARE_PCI() macro can then be
used and it is also modified to return 'bool' rather than 'int'.

The patch also modifies libxl_pci_assignable() to use is_pci_in_array() rather
than a separate open-coded equivalent, and also modifies it to return a
'bool' rather than an 'int'.

NOTE: The COMPARE_PCI() macro is also fixed to include the 'domain' in its
      comparison, which should always have been the case.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Acked-by: Wei Liu <wl@xen.org>

tools/libs/light/libxl_internal.h

@@ -4746,9 +4746,10 @@ void libxl__xcinfo2xlinfo(libxl_ctx *ctx,
  * devices have same identifier. */
 #define COMPARE_DEVID(a, b) ((a)->devid == (b)->devid)
 #define COMPARE_DISK(a, b) (!strcmp((a)->vdev, (b)->vdev))
-#define COMPARE_PCI(a, b) ((a)->func == (b)->func &&    \
-                           (a)->bus == (b)->bus &&      \
-                           (a)->dev == (b)->dev)
+#define COMPARE_PCI(a, b) ((a)->domain == (b)->domain && \
+                           (a)->bus == (b)->bus &&       \
+                           (a)->dev == (b)->dev &&       \
+                           (a)->func == (b)->func)
 #define COMPARE_USB(a, b) ((a)->ctrl == (b)->ctrl && \
                            (a)->port == (b)->port)
 #define COMPARE_USBCTRL(a, b) ((a)->devid == (b)->devid)

tools/libs/light/libxl_pci.c

@@ -336,24 +336,17 @@ retry_transaction2:
     return 0;
 }
 
-static int is_pci_in_array(libxl_device_pci *assigned, int num_assigned,
-                           int dom, int bus, int dev, int func)
+static bool is_pci_in_array(libxl_device_pci *pcis, int num,
+                            libxl_device_pci *pci)
 {
     int i;
 
-    for(i = 0; i < num_assigned; i++) {
-        if ( assigned[i].domain != dom )
-            continue;
-        if ( assigned[i].bus != bus )
-            continue;
-        if ( assigned[i].dev != dev )
-            continue;
-        if ( assigned[i].func != func )
-            continue;
-        return 1;
+    for (i = 0; i < num; i++) {
+        if (COMPARE_PCI(pci, &pcis[i]))
+            break;
     }
 
-    return 0;
+    return i < num;
 }
 
 /* Write the standard BDF into the sysfs path given by sysfs_path. */
@@ -1487,21 +1480,17 @@ int libxl_device_pci_add(libxl_ctx *ctx, uint32_t domid,
     return AO_INPROGRESS;
 }
 
-static int libxl_pci_assignable(libxl_ctx *ctx, libxl_device_pci *pci)
+static bool libxl_pci_assignable(libxl_ctx *ctx, libxl_device_pci *pci)
 {
     libxl_device_pci *pcis;
-    int num, i;
+    int num;
+    bool assignable;
 
     pcis = libxl_device_pci_assignable_list(ctx, &num);
-    for (i = 0; i < num; i++) {
-        if (pcis[i].domain == pci->domain &&
-            pcis[i].bus == pci->bus &&
-            pcis[i].dev == pci->dev &&
-            pcis[i].func == pci->func)
-            break;
-    }
+    assignable = is_pci_in_array(pcis, num, pci);
     libxl_device_pci_assignable_list_free(pcis, num);
-    return i != num;
+
+    return assignable;
 }
 
 static void device_pci_add_stubdom_wait(libxl__egc *egc,
@@ -1834,8 +1823,7 @@ static void do_pci_remove(libxl__egc *egc, pci_remove_state *prs)
         goto out_fail;
     }
 
-    attached = is_pci_in_array(pcis, num, pci->domain,
-                               pci->bus, pci->dev, pci->func);
+    attached = is_pci_in_array(pcis, num, pci);
     libxl_device_pci_list_free(pcis, num);
 
     rc = ERROR_INVAL;