Quoting Tejun Heo (2017-06-13 14:58:49) > Cc'ing David Airlie. > > This is from drm driver calling in idr_replace() w/ a negative id. > Probably a silly bug in error handling path?
No, this is the validation of an invalid userspace handle. The drm ABI for handles is supposed to be a full u32 range with 0 reserved for an invalid handle (constrained by the idr_alloc ofc). The WARN was introduced by 0a835c4f090a. -Chris
