[ts-7000] Resetting USB Host on 7400 ?

["ilinsdell" <>]

I'm experiencing and intermittent issue when mounting a FAT32 file 
system via the 7400 USB Master port.

My program mounts a USB Mass Storage Client, copies some files from 
it and then umounts it.

Intermittently, I get the following error from mount:

$mount: Mounting /dev/scsi/host0/bus0/target0/lun0/disc 
on /mnt/slave0 failed: No such device or address

1. dmesg shows the following:
     hub.c: new USB device not_pci-1, assigned address 35
     WARNING: USB Mass Storage data integrity not assured
     USB Mass Storage device found at 35

2. cat /proc/scsi/usb-storage-0/0 shows the following:

   Host scsi0: usb-storage
   Vendor: PNY Inc.
   Product: PNY Mass Storage Drive
   Serial Number: None
   Protocol: Transparent SCSI
   Transport: Bulk
   GUID: 04d800090000000000000000
   Attached: Yes

3. ls -al /dev/scsi/host0/bus0/target0/lun0/disc shows the following:
    brw-------    1 root     root       8,   0 Jan  1 
1970 /dev/scsi/host0/bus0/target0/lun0/disc

4. lsmod shows the following:

    Module                  Size  Used by    Tainted: P  
    usb-storage            55912   0
    sd_mod                 11100   0
    scsi_mod               53816   2 [usb-storage sd_mod]
    usb-ohci-ep93xx          888   0 (unused)
    usb-ohci               15584   0 [usb-ohci-ep93xx]
    pcipool                 2072   1 [usb-ohci-ep93xx usb-ohci]
    usbcore                55944   1 [usb-storage usb-ohci]
    af_packet               9448   0
    vfat                   10140   0
    tsuart0                 8880   0
    fat                    29608   0 [vfat]
    sdcard                 11664   1
    ts7xxx_nand             1896   0 (unused)

5. Rebooting the 7400 resolves the issue, at least until next time.

Anyone seen this before ? or does anyone know how to reset the Master 
USB driver on the 7400 without having to reboot ?

Thanks.







 
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