From 42dd8243cc7c8870c01f245dab252391375384ef Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Mon, 19 Oct 2015 08:44:35 -0700 Subject: [PATCH] drm/vc4: Drop struct_mutex around CL validation. We were using it so that we could make sure that shader validation state didn't change while we were validating, but now shader validation state is immutable. The bcl/rcl generation doesn't do any other BO dereferencing, and seems to have no other global state dependency not covered by job_lock / bo_lock. Fixes a lock order reversal between mmap_sem and struct_mutex. Signed-off-by: Eric Anholt --- drivers/gpu/drm/vc4/vc4_gem.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -244,13 +244,15 @@ static void vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec) { struct vc4_dev *vc4 = to_vc4_dev(dev); - uint64_t seqno = ++vc4->emit_seqno; + uint64_t seqno; unsigned long irqflags; + spin_lock_irqsave(&vc4->job_lock, irqflags); + + seqno = ++vc4->emit_seqno; exec->seqno = seqno; vc4_update_bo_seqnos(exec, seqno); - spin_lock_irqsave(&vc4->job_lock, irqflags); list_add_tail(&exec->head, &vc4->job_list); /* If no job was executing, kick ours off. Otherwise, it'll @@ -608,8 +610,6 @@ vc4_submit_cl_ioctl(struct drm_device *d exec->args = args; INIT_LIST_HEAD(&exec->unref_list); - mutex_lock(&dev->struct_mutex); - ret = vc4_cl_lookup_bos(dev, file_priv, exec); if (ret) goto fail; @@ -636,15 +636,11 @@ vc4_submit_cl_ioctl(struct drm_device *d /* Return the seqno for our job. */ args->seqno = vc4->emit_seqno; - mutex_unlock(&dev->struct_mutex); - return 0; fail: vc4_complete_exec(exec); - mutex_unlock(&dev->struct_mutex); - return ret; }