lib/debugfs: Phase out igt_debugfs_fopen()

Wrapping fdopen() proved dangerous, the underlying fd is not refcounted,
and we must close it in the library or else we easily leak and exhaust
all fd. Since we can't provide igt_debugfs_fopen(), move the burden onto
the caller for those that require a stream FILE*.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 13 insertions, 3 deletions

diff --git a/tools/intel_dp_compliance.c b/tools/intel_dp_compliance.c
index 4b4d255d..c40548e7 100644
--- a/tools/intel_dp_compliance.c
+++ b/tools/intel_dp_compliance.c
@@ -227,17 +227,27 @@ static void clear_test_active(void)
 	fflush(test_active_fp);
 }
 
+static FILE *fopenat(int dir, const char *name, const char *mode)
+{
+	int fd = openat(dir, name, O_RDWR);
+	return fdopen(fd, mode);
+}
+
 static void setup_debugfs_files(void)
 {
-	test_type_fp = igt_debugfs_fopen(drm_fd, INTEL_DP_TEST_TYPE_FILE, "r");
+	int dir = igt_debugfs_dir(drm_fd);
+
+	test_type_fp = fopenat(dir, INTEL_DP_TEST_TYPE_FILE, "r");
 	igt_require(test_type_fp);
 
-	test_data_fp = igt_debugfs_fopen(drm_fd, INTEL_DP_TEST_DATA_FILE, "r");
+	test_data_fp = fopenat(dir, INTEL_DP_TEST_DATA_FILE, "r");
 	igt_require(test_data_fp);
 
-	test_active_fp = igt_debugfs_fopen(drm_fd, INTEL_DP_TEST_ACTIVE_FILE, "w+");
+	test_active_fp = fopenat(dir, INTEL_DP_TEST_ACTIVE_FILE, "w+");
 	igt_require(test_active_fp);
 
+	close(dir);
+
 	/* Reset the active flag for safety */
 	clear_test_active();
 }