On Wed, 30 Mar 2022, Felix Kuehling wrote: > > Am 2022-03-30 um 03:51 schrieb Lee Jones: > > This ensures userspace cannot prematurely clean-up the client before > > it is fully initialised which has been proven to cause issues in the > > past. > > > > Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx> > > Cc: Alex Deucher <alexander.deucher@xxxxxxx> > > Cc: "Christian König" <christian.koenig@xxxxxxx> > > Cc: "Pan, Xinhui" <Xinhui.Pan@xxxxxxx> > > Cc: David Airlie <airlied@xxxxxxxx> > > Cc: Daniel Vetter <daniel@xxxxxxxx> > > Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx > > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx > > Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> > > --- > > drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 18 +++++++++--------- > > 1 file changed, 9 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c > > index e4beebb1c80a2..c5d5398d45cbf 100644 > > --- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c > > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c > > @@ -247,15 +247,6 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd) > > return ret; > > } > > - ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client, > > - O_RDWR); > > - if (ret < 0) { > > - kfifo_free(&client->fifo); > > - kfree(client); > > - return ret; > > - } > > - *fd = ret; > > - > > init_waitqueue_head(&client->wait_queue); > > spin_lock_init(&client->lock); > > client->events = 0; > > @@ -265,5 +256,14 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd) > > list_add_rcu(&client->list, &dev->smi_clients); > > spin_unlock(&dev->smi_lock); > > + ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client, > > + O_RDWR); > > + if (ret < 0) { > > Thank you for the patch. This looks like the correct solution. But you also > need to remove the client from the dev->smi_clients list here before > kfree(client). With that fixed, the patch is Yes, that makes perfect sense. > Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx> Thanks Felix. I will provide a follow-up tomorrow. -- Lee Jones [李琼斯] Principal Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog