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The is_valid flag should reflect the validity state of both the XXX_start and XXX_stop functions. But the use of '=' in XXX_stop overwrites the validity state set by XXX_start. This commit changes '=' to '|=' in XXX_stop to preserve and combine the validity state of XXX_start and XXX_stop. Signed-off-by: wangfushuai <wangfushuai@baidu.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>