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[AMD Official Use Only]
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
From: Chen, Guchun <Guchun.Chen@xxxxxxx>
Sent: Monday, January 10, 2022 12:13 AM To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>; Zytaruk, Kelly <Kelly.Zytaruk@xxxxxxx>; Huang, Qiliang (Warden) <Qiliang.Huang@xxxxxxx>; Zhang, Bokun <Bokun.Zhang@xxxxxxx> Cc: Chen, Guchun <Guchun.Chen@xxxxxxx> Subject: [PATCH] drm/amdgpu: use spin_lock_irqsave to avoid deadlock by local interrupt This is observed in SRIOV case with virtual KMS as display.
_raw_spin_lock_irqsave+0x37/0x40 drm_handle_vblank+0x69/0x350 [drm] ? try_to_wake_up+0x432/0x5c0 ? amdgpu_vkms_prepare_fb+0x1c0/0x1c0 [amdgpu] drm_crtc_handle_vblank+0x17/0x20 [drm] amdgpu_vkms_vblank_simulate+0x4d/0x80 [amdgpu] __hrtimer_run_queues+0xfb/0x230 hrtimer_interrupt+0x109/0x220 __sysvec_apic_timer_interrupt+0x64/0xe0 asm_call_irq_on_stack+0x12/0x20 Fixes: ba5317109d0c("drm/amdgpu: create amdgpu_vkms (v4)") Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c index 2dcc68e04e84..d99c8779b51e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c @@ -144,15 +144,16 @@ static void amdgpu_vkms_crtc_atomic_disable(struct drm_crtc *crtc, static void amdgpu_vkms_crtc_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state) { + unsigned long flags; if (crtc->state->event) { - spin_lock(&crtc->dev->event_lock); + spin_lock_irqsave(&crtc->dev->event_lock, flags); if (drm_crtc_vblank_get(crtc) != 0) drm_crtc_send_vblank_event(crtc, crtc->state->event); else drm_crtc_arm_vblank_event(crtc, crtc->state->event); - spin_unlock(&crtc->dev->event_lock); + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); crtc->state->event = NULL; } -- 2.17.1 |
