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Pei Zhang authored
It's a classical abba type deadlock when using 2 mutex objects, which are gvt.lock(a) and drm.struct_mutex(b). Deadlock happens in threads: 1. intel_gvt_create/destroy_vgpu: P(a)->P(b) 2. workload_thread: P(b)->P(a) Fix solution is align the lock acquire sequence in both threads. This patch choose to adjust the sequence in workload_thread function. This fixed lockup symptom for guest-reboot stress test. v2: adjust sequence in workload_thread based on zhenyu's suggestion. adjust sequence in create/destroy_vgpu function. v3: fix to still require struct_mutex for dispatch_workload() Signed-off-by:
Pei Zhang <pei.zhang@intel.com> [zhenyuw: fix unused variables warnings.] Signed-off-by:
Zhenyu Wang <zhenyuw@linux.intel.com>
90d27a1b