[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.

Signed-off-by: Lin.Cao <lincao12 at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_debug.c | 3 ++-
 1 file changed, 2 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..55ce50ba4be2 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
-- 
2.25.1