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Lin" , Singo Chang , Nancy Lin , Shawn Sung , , , , , Subject: [PATCH] drm/mediatek: Add spinlock for setting vblank event in atomic_begin Date: Tue, 22 Aug 2023 21:26:46 +0800 Message-ID: <20230822132646.9811-1-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230822_062707_888572_9F747014 X-CRM114-Status: UNSURE ( 9.98 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Add spinlock protection to avoid race condition on vblank event between mtk_drm_crtc_atomic_begin() and mtk_drm_finish_page_flip(). Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Signed-off-by: Jason-JH.Lin Reviewed-by: Fei Shao Reviewed-by: Alexandre Mergnat Tested-by: Fei Shao --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index d40142842f85..128a672fe3c9 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -746,6 +746,9 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc, crtc); struct mtk_crtc_state *mtk_crtc_state = to_mtk_crtc_state(crtc_state); struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); + unsigned long flags; + + spin_lock_irqsave(&crtc->dev->event_lock, flags); if (mtk_crtc->event && mtk_crtc_state->base.event) DRM_ERROR("new event while there is still a pending event\n"); @@ -756,6 +759,8 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc, mtk_crtc->event = mtk_crtc_state->base.event; mtk_crtc_state->base.event = NULL; } + + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); } static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,