Lizhi Hou c8d2530791
accel/amdxdna: Fix deadlock on debug BO command timeout ...
Both amdxdna_hwctx_sync_debug_bo() and amdxdna_drm_config_hwctx_ioctl()
hold xdna->dev_lock while invoking backend operations. If the hardware
hangs, aie2_cmd_wait() blocks waiting for a firmware response. When the
DRM scheduler timeout expires, aie2_sched_job_timedout() is invoked to
reset the hardware. However, the timeout handler also attempts to acquire
dev_lock, resulting in a deadlock.
Avoid this by releasing dev_lock before waiting for the firmware
response and reacquiring it after the wait completes. This allows the
timeout handler to proceed with device recovery when a debug BO command
times out.
Fixes: 7ea0468380max.zhen@amd.com >
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com >
Link: https://patch.msgid.link/20260707055732.479103-1-lizhi.hou@amd.com
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