您好
我使用的是linux3.2的内核，在使用USB转4hub上，插入两个U盘，两个u盘之间拷贝数据，发现几十k的文件传输没有问题，但1-10M的文件传输会报错，执行流程以及报错放到下面，谢谢了。
还有一个现象，u盘和文件系统之间的拷贝是完全没有问题，而且两个U盘同时向文件系统拷贝文件也是没有问题的，但两U盘之间就是拷贝不了大文件，所以没有办法了，希望帮忙看看
root@ok335x:~# [ 47.651818] usb 1-1.4: new high-speed USB device number 3 using musb-hdrc
[ 47.775897] usb 1-1.4: New USB device found, idVendor=05e3, idProduct=0749
[ 47.783125] usb 1-1.4: New USB device strings: Mfr=3, Product=4, SerialNumber=5
[ 47.790777] usb 1-1.4: Product: USB3.0 Card Reader
[ 47.795795] usb 1-1.4: Manufacturer: Generic
[ 47.800260] usb 1-1.4: SerialNumber: 000000001536
[ 47.811989] scsi0 : usb-storage 1-1.4:1.0
[ 48.813573] scsi 0:0:0:0: Direct-Access Generic MassStorageClass 1536 PQ: 0 ANSI: 6
[ 50.005570] sd 0:0:0:0: [sda] Unit Not Ready
[ 50.010071] sd 0:0:0:0: [sda] Sense Key : 0xb [current]
[ 50.015771] sd 0:0:0:0: [sda] ASC=0x30 ASCQ=0x0
[ 50.345849] sd 0:0:0:0: [sda] 15523840 512-byte logical blocks: (7.94 GB/7.40 GiB)
[ 50.355249] sd 0:0:0:0: [sda] Write Protect is off
[ 50.361535] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 50.382019] sda: sda1
[ 50.391026] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 57.891818] usb 1-1.1: new high-speed USB device number 4 using musb-hdrc
[ 58.015891] usb 1-1.1: New USB device found, idVendor=05e3, idProduct=0749
[ 58.023123] usb 1-1.1: New USB device strings: Mfr=3, Product=4, SerialNumber=5
[ 58.030772] usb 1-1.1: Product: USB3.0 Card Reader
[ 58.035793] usb 1-1.1: Manufacturer: Generic
[ 58.040258] usb 1-1.1: SerialNumber: 000000001536
[ 58.051579] scsi1 : usb-storage 1-1.1:1.0
[ 59.053574] scsi 1:0:0:0: Direct-Access Generic MassStorageClass 1536 PQ: 0 ANSI: 6
[ 59.392629] sd 1:0:0:0: [sdb] 15523840 512-byte logical blocks: (7.94 GB/7.40 GiB)
[ 59.402175] sd 1:0:0:0: [sdb] Write Protect is off
[ 59.408442] sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 59.428655] sdb: sdb1 sdb2
[ 59.438757] sd 1:0:0:0: [sdb] Attached SCSI removable disk
[ 59.592864] EXT3-fs (sdb2): error: couldn't mount because of unsupported optional features (240)
[ 59.614134] EXT2-fs (sdb2): error: couldn't mount because of unsupported optional features (244)
[ 59.654602] EXT3-fs (sdb2): error: couldn't mount because of unsupported optional features (240)
[ 59.668413] EXT2-fs (sdb2): error: couldn't mount because of unsupported optional features (244)
[ 59.686423] yaffs: dev is 8388626 name is "sdb2" rw
[ 59.691538] yaffs: passed flags ""
[ 59.696110] yaffs: dev is 8388626 name is "sdb2" rw
[ 59.701216] yaffs: passed flags ""
root@ok335x:/media# cp sda1/app-debug.apk /media/sdb1/
[ 164.361829] usb 1-1.4: reset high-speed USB device number 3 using musb-hdrc
[ 180.561820] usb 1-1.4: reset high-speed USB device number 3 using musb-hdrc
[ 180.761816] usb 1-1.4: reset high-speed USB device number 3 using musb-hdrc
[ 187.201817] usb 1-1.1: reset high-speed USB device number 4 using musb-hdrc
[ 190.961815] usb 1-1.4: reset high-speed USB device number 3 using musb-hdrc
[ 191.084675] sd 0:0:0:0: Device offlined - not ready after error recovery
[ 191.091746] sd 0:0:0:0: [sda] Unhandled error code
[ 191.096797] sd 0:0:0:0: [sda] Result: hostbyte=0x05 driverbyte=0x00
[ 191.103480] sd 0:0:0:0: [sda] CDB: cdb[0]=0x28: 28 00 00 04 b9 5c 00 00 f0 00
[ 191.111012] end_request: I/O error, dev sda, sector 309596
[ 191.116847] sd 0:0:0:0: rejecting I/O to offline device
[ 191.122334] sd 0:0:0:0: [sda] killing request
[ 191.126928] sd 0:0:0:0: rejecting I/O to offline device
[ 191.132436] sd 0:0:0:0: rejecting I/O to offline device
[ 191.137955] sd 0:0:0:0: [sda] Unhandled error code
[ 191.142991] sd 0:0:0:0: [sda] Result: hostbyte=0x01 driverbyte=0x00
[ 191.149663] sd 0:0:0:0: [sda] CDB: cdb[0]=0x28: 28 00 00 04 ba 4c 00 00 10 00
[ 191.157193] end_request: I/O error, dev sda, sector 309836
[ 191.163308] sd 0:0:0:0: rejecting I/O to offline device
cp: read error: Input/output error
root@ok335x:/media# [ 197.401825] usb 1-1.1: reset high-speed USB device number 4 using musb-hdrc
[ 213.601818] usb 1-1.1: reset high-speed USB device number 4 using musb-hdrc
[ 213.801806] usb 1-1.1: reset high-speed USB device number 4 using musb-hdrc
