[PATCH i-g-t v4 4/5] lib/gem_engine_topology: Simplify the method of opening a primary

[Janusz Krzysztofik]

When opening a potential primary counterpart of a render device, we first
open a parent directory of the render node and pass it to openat() that
can open a path relative to that directory.  But on the other hand, we
build and pass to that function a path of that primary that is absolute,
not relative.  While that construct gives the expected result anyway, it
makes the picture unclear.

Use open() and drop unused code.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
 lib/i915/gem_engine_topology.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
index 8589af5c1a..c8c1079223 100644
--- a/lib/i915/gem_engine_topology.c
+++ b/lib/i915/gem_engine_topology.c
@@ -470,14 +470,10 @@ static int __open_primary(int dir)
 	if (igt_debug_on(readlinkat(dir, "device", target, sizeof(target)) < 0))
 		return dir;
 
-	fd = openat(dir, "..", O_RDONLY);
-	if (fd < 0)
-		return dir;
-
 	close(dir);
 	for (minor = 0; minor < 64; minor++) {
 		sprintf(buf, "/sys/dev/char/%d:%d", major, minor);
-		dir = openat(fd, buf, O_RDONLY);
+		dir = open(buf, O_RDONLY);
 		if (dir < 0)
 			continue;
 
@@ -488,7 +484,6 @@ static int __open_primary(int dir)
 		close(dir);
 		dir = -1;
 	}
-	close(fd);
 
 	return dir;
 }
-- 
2.45.2