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drm/amd/display: Spinlock before reading event

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[ Upstream commit ae13c8a5cf ]

[WHY & HOW]
A read of acrtc_attach->base.state->event was not locked so moving it
inside the spinlock.

This fixes a LOCK_EVASION issue reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2024-04-26 10:33:47 -06:00 committed by Greg Kroah-Hartman
parent 313d3dd4ca
commit af43ed726f
1 changed files with 6 additions and 8 deletions
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14
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -8286,15 +8286,13 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
bundle->stream_update.vrr_infopacket =
&acrtc_state->stream->vrr_infopacket;
}
} else if (cursor_update && acrtc_state->active_planes > 0 &&
acrtc_attach->base.state->event) {
drm_crtc_vblank_get(pcrtc);
} else if (cursor_update && acrtc_state->active_planes > 0) {
spin_lock_irqsave(&pcrtc->dev->event_lock, flags);
acrtc_attach->event = acrtc_attach->base.state->event;
acrtc_attach->base.state->event = NULL;
if (acrtc_attach->base.state->event) {
drm_crtc_vblank_get(pcrtc);
acrtc_attach->event = acrtc_attach->base.state->event;
acrtc_attach->base.state->event = NULL;
}
spin_unlock_irqrestore(&pcrtc->dev->event_lock, flags);
}