[PATCH] drm/amdkfd: Check debug trap enable before write dbg_ev_file

[Lin . Cao]

In interrupt context, write dbg_ev_file will be run by work queue. It
will cause write dbg_ev_file execution after debug_trap_disable, which
will cause NULL pointer access.
v2: cancel work "debug_event_workarea" before set dbg_ev_file as NULL.

Signed-off-by: Lin.Cao <linca...@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_debug.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
index d889e3545120..6c2f6a26c479 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
@@ -103,7 +103,8 @@ void debug_event_write_work_handler(struct work_struct 
*work)
                        struct kfd_process,
                        debug_event_workarea);
 
-       kernel_write(process->dbg_ev_file, &write_data, 1, &pos);
+       if (process->debug_trap_enabled && process->dbg_ev_file)
+               kernel_write(process->dbg_ev_file, &write_data, 1, &pos);
 }
 
 /* update process/device/queue exception status, write to descriptor
@@ -645,6 +646,7 @@ int kfd_dbg_trap_disable(struct kfd_process *target)
        else if (target->runtime_info.runtime_state != 
DEBUG_RUNTIME_STATE_DISABLED)
                target->runtime_info.runtime_state = 
DEBUG_RUNTIME_STATE_ENABLED;
 
+       cancel_work_sync(&target->debug_event_workarea);
        fput(target->dbg_ev_file);
        target->dbg_ev_file = NULL;
 
-- 
2.25.1