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After the device memory is cleared, if the software sends the doorbell operation, the hardware may trigger a axi error when processing the doorbell. This error is caused by memory clearing and hardware access to address 0. Therefore, the axi error is masked during this period. Signed-off-by: Weili Qian <qianweili@huawei.com> Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>