Hello,
I find a drmOpen failed issue in our system as below description:
platform: ivy-bridge OS: Ubuntu12.04 LTS kernel: 3.13.0-32-generic libdrm: libdrm-2.4.46
root@tchen37-ivb:/home/tchen37/ws/lib3app/utests# ./test_osd DRM_IOCTL_I915_GEM_APERTURE failed: Bad file descriptor Assuming 131072kB available aperture size. May lead to reduced performance or incorrect rendering. get chip id failed: -1 [9] param: 4, val: 0 Segmentation fault (core dumped)
by debugging libdrm code, I find following changes resolve the problem
diff --git a/xf86drm.c b/xf86drm.c index 4791a05..3c7c362 100644 --- a/xf86drm.c +++ b/xf86drm.c @@ -562,7 +562,7 @@ static int drmOpenByName(const char *name) drmFreeVersion(version); id = drmGetBusid(fd); drmMsg("drmGetBusid returned '%s'\n", id ? id : "NULL"); - if (!id || !*id) { + if (id || *id) { if (id) drmFreeBusid(id); return fd;
I know I'm not using the latest version of libdrm, but I confirm that latest code remains same for this scenario.
Is it possible a bug of libdrm?
Thanks, -Jet