From: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx> During QAIC_ATTACH_SLICE_BO, we associate a BO to its DBC. We need to grab the dbc->ch_lock to make sure that DBC does not goes away while QAIC_ATTACH_SLICE_BO is still running. Fixes: ff13be830333 ("accel/qaic: Add datapath") Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx> Reviewed-by: Carl Vanderlip <quic_carlv@xxxxxxxxxxx> Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx> Signed-off-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx> --- drivers/accel/qaic/qaic_data.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c index 8603e99a2a61..8ab26e64b231 100644 --- a/drivers/accel/qaic/qaic_data.c +++ b/drivers/accel/qaic/qaic_data.c @@ -924,8 +924,8 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi { struct qaic_attach_slice_entry *slice_ent; struct qaic_attach_slice *args = data; + int rcu_id, usr_rcu_id, qdev_rcu_id; struct dma_bridge_chan *dbc; - int usr_rcu_id, qdev_rcu_id; struct drm_gem_object *obj; struct qaic_device *qdev; unsigned long arg_size; @@ -969,12 +969,6 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi goto unlock_dev_srcu; } - dbc = &qdev->dbc[args->hdr.dbc_id]; - if (dbc->usr != usr) { - ret = -EINVAL; - goto unlock_dev_srcu; - } - user_data = u64_to_user_ptr(args->data); slice_ent = kzalloc(arg_size, GFP_KERNEL); @@ -1006,9 +1000,16 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi goto put_bo; } + dbc = &qdev->dbc[args->hdr.dbc_id]; + rcu_id = srcu_read_lock(&dbc->ch_lock); + if (dbc->usr != usr) { + ret = -EINVAL; + goto unlock_ch_srcu; + } + ret = qaic_prepare_bo(qdev, bo, &args->hdr); if (ret) - goto put_bo; + goto unlock_ch_srcu; ret = qaic_attach_slicing_bo(qdev, bo, &args->hdr, slice_ent); if (ret) @@ -1018,6 +1019,7 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, args->hdr.dir); bo->dbc = dbc; + srcu_read_unlock(&dbc->ch_lock, rcu_id); drm_gem_object_put(obj); srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id); srcu_read_unlock(&usr->qddev_lock, usr_rcu_id); @@ -1026,6 +1028,8 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi unprepare_bo: qaic_unprepare_bo(qdev, bo); +unlock_ch_srcu: + srcu_read_unlock(&dbc->ch_lock, rcu_id); put_bo: drm_gem_object_put(obj); free_slice_ent: -- 2.40.1