If the temporarily applied memory is used to set or get the xqc
information, the driver releases the memory immediately after the
hardware mailbox operation time exceeds the driver waiting time.
However, the hardware does not cancel the operation, so the hardware
may write data to released memory.

Therefore, when the driver is bound to a device, the driver reserves
memory for the xqc configuration. The subsequent xqc configuration
uses the reserved memory to prevent hardware from accessing the
released memory.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>