lib: make igt_debugfs_open infallible

(Almost) no one cared anyway.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/igt_debugfs.c

@@ -37,7 +37,7 @@
 /*
  * General debugfs helpers
  */
-int igt_debugfs_init(igt_debugfs_t *debugfs)
+void igt_debugfs_init(igt_debugfs_t *debugfs)
 {
 	const char *path = "/sys/kernel/debug";
 	struct stat st;
@@ -51,11 +51,9 @@ int igt_debugfs_init(igt_debugfs_t *debugfs)
 	if (stat("/sys/kernel/debug/dri", &st) == 0)
 		goto find_minor;
 
-	if (stat("/sys/kernel/debug", &st))
-		return errno;
+	igt_assert(stat("/sys/kernel/debug", &st) == 0);
 
-	if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
-		return errno;
+	igt_assert(mount("debug", "/sys/kernel/debug", "debugfs", 0, 0) == 0);
 
 find_minor:
 	strcpy(debugfs->root, path);
@@ -64,12 +62,13 @@ find_minor:
 		sprintf(debugfs->dri_path + len, "/i915_error_state");
 		if (stat(debugfs->dri_path, &st) == 0) {
 			debugfs->dri_path[len] = '\0';
-			return 0;
+			return;
 		}
 	}
 
 	debugfs->dri_path[0] = '\0';
-	return ENOENT;
+
+	igt_fail(4);
 }
 
 int igt_debugfs_open(igt_debugfs_t *debugfs, const char *filename, int mode)

lib/igt_debugfs.h

@@ -36,7 +36,7 @@ typedef struct {
 	char dri_path[128];
 } igt_debugfs_t;
 
-int igt_debugfs_init(igt_debugfs_t *debugfs);
+void igt_debugfs_init(igt_debugfs_t *debugfs);
 int igt_debugfs_open(igt_debugfs_t *debugfs, const char *filename, int mode);
 FILE *igt_debugfs_fopen(igt_debugfs_t *debugfs, const char *filename,
 			const char *mode);

tests/gem_reset_stats.c

@@ -1041,7 +1041,7 @@ igt_main
 			      "Kernel is too old, or contexts not supported: %s\n",
 			      strerror(errno));
 
-		assert(igt_debugfs_init(&dfs) == 0);
+		igt_debugfs_init(&dfs);
 	}
 
 	igt_subtest("params")