Re: [PATCH] drm/amdgpu: use spin_lock_irqsave to avoid deadlock by local interrupt

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Am 11.01.22 um 06:21 schrieb Guchun Chen:
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>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Tested-by: Kelly Zytaruk <kelly.zytaruk@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) {

Please add an empty line between decleration and code, apart from that feel free to add an Acked-by: Christian König <christian.koenig@xxxxxxx> to the patch as well.

Regards,
Christian.

-		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;
  	}




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