libdrm: add udev support.

This patch allows you to --enable-udev, and will avoid having libdrm
make device nodes. If you are using udev, you should really --enable-udev
your libdrm.

1 files changed, 25 insertions, 0 deletions

diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c
index 7202c8d7..c36f1964 100644
--- a/libdrm/xf86drm.c
+++ b/libdrm/xf86drm.c
@@ -297,6 +297,7 @@ static int drmOpenDevice(long dev, int minor)
 	group = (serv_group >= 0) ? serv_group : DRM_DEV_GID;
     }
 
+#if !defined(UDEV)
     if (stat(DRM_DIR_NAME, &st)) {
 	if (!isroot)
 	    return DRM_ERR_NOT_ROOT;
@@ -317,6 +318,30 @@ static int drmOpenDevice(long dev, int minor)
 	chown(buf, user, group);
 	chmod(buf, devmode);
     }
+#else
+    /* if we modprobed then wait for udev */
+    {
+	int udev_count = 0;
+wait_for_udev:
+        if (stat(DRM_DIR_NAME, &st)) {
+		usleep(20);
+		udev_count++;
+
+		if (udev_count == 50)
+			return -1;
+		goto wait_for_udev;
+	}
+
+    	if (stat(buf, &st)) {
+		usleep(20);
+		udev_count++;
+
+		if (udev_count == 50)
+			return -1;
+		goto wait_for_udev;
+    	}
+    }
+#endif
 
     fd = open(buf, O_RDWR, 0);
     drmMsg("drmOpenDevice: open result is %d, (%s)\n",