From 4ec2b69da5e1544dbadb30cddb49c8df60209b0c Mon Sep 17 00:00:00 2001 From: Xiongfeng Wang Date: Thu, 12 Nov 2020 21:22:32 +0800 Subject: [PATCH] drm/i915/gvt: return error when failing to take the module reference When we fail to take the module reference, we go to the 'undo*' branch and return. But the returned variable 'ret' has been set as zero by the above code. Change 'ret' to '-ENODEV' in this situation. Fixes: 9bdb073464d6 ("drm/i915/gvt: Change KVMGT as self load module") Reviewed-by: Zhenyu Wang Reported-by: Hulk Robot Signed-off-by: Xiongfeng Wang Signed-off-by: Zhenyu Wang Link: http://patchwork.freedesktop.org/patch/msgid/1605187352-51761-1-git-send-email-wangxiongfeng2@huawei.com --- drivers/gpu/drm/i915/gvt/kvmgt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index ad8a9df49f29..778eb8cab610 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -829,8 +829,10 @@ static int intel_vgpu_open(struct mdev_device *mdev) /* Take a module reference as mdev core doesn't take * a reference for vendor driver. */ - if (!try_module_get(THIS_MODULE)) + if (!try_module_get(THIS_MODULE)) { + ret = -ENODEV; goto undo_group; + } ret = kvmgt_guest_init(mdev); if (ret) -- 2.17.1