drm/amd/display: Fix deadlock when flushing irq

Lock irq table when reading a work in queue,
unlock to flush the work, lock again till all tasks
are cleared

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
index 490017df371d..4be21bf54749 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
@@ -329,14 +329,15 @@ void amdgpu_dm_irq_fini(struct amdgpu_device *adev)
 {
         int src;
         struct irq_list_head *lh;
+        unsigned long irq_table_flags;
         DRM_DEBUG_KMS("DM_IRQ: releasing resources.\n");
-
         for (src = 0; src < DAL_IRQ_SOURCES_NUMBER; src++) {
-
+                DM_IRQ_TABLE_LOCK(adev, irq_table_flags);
                 /* The handler was removed from the table,
                  * it means it is safe to flush all the 'work'
                  * (because no code can schedule a new one). */
                 lh = &adev->dm.irq_handler_list_low_tab[src];
+                DM_IRQ_TABLE_UNLOCK(adev, irq_table_flags);
                 flush_work(&lh->work);
         }
 }