嵌入式linux 外接hub，hub 两个端口之间 copy出错hub_port_status failed (err = -32

trackoftime

高手帮忙分析下，MTK mips MCU 在外接一个 hub 的时候，port1 接 HDD,port3 接 SD,挂载成功后,串口下指令:
1。cp /mnt/SD /mnt/HDD 一次 cp 单文件没问题，多文件出错，cp 单个文件没问题。
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: cannot reset port 2 (err = -79)

2. cp /mnt/HDD /mnt/SD 一次 cp 单个文件或者多个文件都有问题

hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: cannot reset port 2 (err = -79)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: cannot reset port 2 (err = -79)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: Cannot enable port 2.  Maybe the USB cable is bad?
hub 1-1:1.0: cannot disable port 2 (err = -79)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: cannot reset port 2 (err = -79)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: cannot reset port 2 (err = -79)
hub 1-1:1.0: hub_port_status failed (err = -32)
hub 1-1:1.0: hub_port_status failed (err = -32)