commit 7c27cd7c5da0b87cea0dacd454307e2613d3b415
author Adam Jackson <ajax@redhat.com> Thu May 04 10:48:56 2017 -0400
committer Adam Jackson <ajax@redhat.com> Thu May 04 14:36:25 2017 -0400
tree 27f1e68b8c4746f6e3c93f56c36041d75a0bd99e
parent 00aa2c18810efb896afd9ff0acbadd4aa9540fe6

Export drmDevicesEqual

drmCompareBusInfo was almost this already, but it wasn't exported, its
name didn't match its functionality, and while it almost looks like it
was usable for sorting due to memcmp it wouldn't work if you had
multiple bus types. I don't really want to think about defining a
sensible sort order for bus types, so let's at least make it less of a
trap for the caller.

Invert its boolean sense to be 'true if equal', rename it to describe
the types it actually operates on, and export.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.velilkov@collabora.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

xf86drm.c

diff --git a/xf86drm.c b/xf86drm.c
index 685cf69..29fea33 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3029,32 +3029,32 @@
 #endif
 }
 
-static int drmCompareBusInfo(drmDevicePtr a, drmDevicePtr b)
+int drmDevicesEqual(drmDevicePtr a, drmDevicePtr b)
 {
     if (a == NULL || b == NULL)
-        return -1;
+        return 0;
 
     if (a->bustype != b->bustype)
-        return -1;
+        return 0;
 
     switch (a->bustype) {
     case DRM_BUS_PCI:
-        return memcmp(a->businfo.pci, b->businfo.pci, sizeof(drmPciBusInfo));
+        return memcmp(a->businfo.pci, b->businfo.pci, sizeof(drmPciBusInfo)) == 0;
 
     case DRM_BUS_USB:
-        return memcmp(a->businfo.usb, b->businfo.usb, sizeof(drmUsbBusInfo));
+        return memcmp(a->businfo.usb, b->businfo.usb, sizeof(drmUsbBusInfo)) == 0;
 
     case DRM_BUS_PLATFORM:
-        return memcmp(a->businfo.platform, b->businfo.platform, sizeof(drmPlatformBusInfo));
+        return memcmp(a->businfo.platform, b->businfo.platform, sizeof(drmPlatformBusInfo)) == 0;
 
     case DRM_BUS_HOST1X:
-        return memcmp(a->businfo.host1x, b->businfo.host1x, sizeof(drmHost1xBusInfo));
+        return memcmp(a->businfo.host1x, b->businfo.host1x, sizeof(drmHost1xBusInfo)) == 0;
 
     default:
         break;
     }
 
-    return -1;
+    return 0;
 }
 
 static int drmGetNodeType(const char *name)
@@ -3669,7 +3669,7 @@
 
     for (i = 0; i < count; i++) {
         for (j = i + 1; j < count; j++) {
-            if (drmCompareBusInfo(local_devices[i], local_devices[j]) == 0) {
+            if (drmCompareDevices(local_devices[i], local_devices[j])) {
                 local_devices[i]->available_nodes |= local_devices[j]->available_nodes;
                 node_type = log2(local_devices[j]->available_nodes);
                 memcpy(local_devices[i]->nodes[node_type],

xf86drm.h

diff --git a/xf86drm.h b/xf86drm.h
index d75ca8c..74f54f1 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -851,6 +851,8 @@
 extern int drmGetDevice2(int fd, uint32_t flags, drmDevicePtr *device);
 extern int drmGetDevices2(uint32_t flags, drmDevicePtr devices[], int max_devices);
 
+extern int drmDevicesEqual(drmDevicePtr a, drmDevicePtr b);
+
 #if defined(__cplusplus)
 }
 #endif