[PATCH 5.14 753/849] Revert "drm/imx: Annotate dma-fence critical section in commit path"

Greg Kroah-Hartman
2021-11-16T01:16:33Z

From: Fabio Estevam <festevam@gmail.com>

[ Upstream commit 14d9a37c952588930d7226953359fea3ab956d39 ]

This reverts commit f4b34faa08428d813fc3629f882c503487f94a12.

Since commit f4b34faa0842 ("drm/imx: Annotate dma-fence critical section in
commit path") the following possible circular dependency is detected:

[ 5.001811] ======================================================
[ 5.001817] WARNING: possible circular locking dependency detected
[ 5.001824] 5.14.9-01225-g45da36cc6fcc-dirty #1 Tainted: G W
[ 5.001833] ------------------------------------------------------
[ 5.001838] kworker/u8:0/7 is trying to acquire lock:
[ 5.001848] c1752080 (regulator_list_mutex){+.+.}-{3:3}, at: regulator_lock_dependent+0x40/0x294
[ 5.001903]
[ 5.001903] but task is already holding lock:
[ 5.001909] c176df78 (dma_fence_map){++++}-{0:0}, at: imx_drm_atomic_commit_tail+0x10/0x160
[ 5.001957]
[ 5.001957] which lock already depends on the new lock.
...

Revert it for now.

Tested on a imx6q-sabresd.

Fixes: f4b34faa0842 ("drm/imx: Annotate dma-fence critical section in commit path")
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211104001112.4035691-1-festevam@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/imx/imx-drm-core.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index 76819a8ac37fe..3ccadfa14d6a8 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -81,7 +81,6 @@ static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
struct drm_plane_state *old_plane_state, *new_plane_state;
bool plane_disabling = false;
int i;
- bool fence_cookie = dma_fence_begin_signalling();

drm_atomic_helper_commit_modeset_disables(dev, state);

@@ -112,7 +111,6 @@ static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
}

drm_atomic_helper_commit_hw_done(state);
- dma_fence_end_signalling(fence_cookie);
}

static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
--
2.33.0