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| author | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2017-08-14 13:07:21 +0300 |
|---|---|---|
| committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2017-08-14 16:47:57 +0300 |
| commit | 7f5d6dac548b983702dd7aac1d463bd88dff50a8 (patch) | |
| tree | af273b0ed62e08a4f9ed76a377aa5acef24f77cc /drivers/gpu/drm/drm_atomic.c | |
| parent | 491ab4700d1b64f5cf2f9055e01613a923df5fab (diff) | |
| download | linux-7f5d6dac548b983702dd7aac1d463bd88dff50a8.tar.xz | |
drm/atomic: Handle -EDEADLK with out-fences correctly
complete_crtc_signaling is freeing fence_state, but when retrying
num_fences and fence_state are not zero'd. This caused duplicate
fd's in the fence_state array, followed by a BUG_ON in fs/file.c
because we reallocate freed memory, and installing over an existing
fd, or potential other fun.
Zero fence_state and num_fences correctly in the retry loop, which
allows kms_atomic_transition to pass.
Fixes: beaf5af48034 ("drm/fence: add out-fences support")
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Brian Starkey <brian.starkey@arm.com> (v10)
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.10+
Testcase: kms_atomic_transitions.plane-all-modeset-transition-fencing
(with CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y)
Link: https://patchwork.freedesktop.org/patch/msgid/20170814100721.13340-1-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> #intel-gfx on irc
Diffstat (limited to 'drivers/gpu/drm/drm_atomic.c')
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index c0f336d23f9c..b43939f24812 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -2167,10 +2167,10 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, struct drm_atomic_state *state; struct drm_modeset_acquire_ctx ctx; struct drm_plane *plane; - struct drm_out_fence_state *fence_state = NULL; + struct drm_out_fence_state *fence_state; unsigned plane_mask; int ret = 0; - unsigned int i, j, num_fences = 0; + unsigned int i, j, num_fences; /* disallow for drivers not supporting atomic: */ if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) @@ -2211,6 +2211,8 @@ retry: plane_mask = 0; copied_objs = 0; copied_props = 0; + fence_state = NULL; + num_fences = 0; for (i = 0; i < arg->count_objs; i++) { uint32_t obj_id, count_props; |