• Massimiliano Ghilardi's avatar
    USB Mass Storage: limit "Rockchip ROCK MP3" device (071b:3203) max I/O to 64 sectors per command · c4766560
    Massimiliano Ghilardi authored
    The MP3/MP4/AVI player "Rockchip ROCK MP3" is seen as a USB disk, but fails
    if more than 128 sectors (64kB) are sent or requested in a single read or write
    command, and disconnects from the USB bus.
    
    Typical kernel log showing the problem is:
    
    usb 3-1: reset high speed USB device using ehci_hcd and address 6
    usb 3-1: reset high speed USB device using ehci_hcd and address 6
    sd 14:0:0:0: [sdb] Result: hostbyte=0x07 driverbyte=0x00
    end_request: I/O error, dev sdb, sector 32
    sd 14:0:0:0: [sdb] Result: hostbyte=0x07 driverbyte=0x00
    end_request: I/O error, dev sdb, sector 32
    usb 3-1: USB disconnect, address 6
    
    This patch works around the device limitation by adding "Rockchip ROCK MP3"
    to unusual USB devices list and limiting data transfers to 64 sectors (32kB)
    per command.
    Tested on 2.6.23-rc5 (amd64).
    Signed-off-by: default avatarMassimiliano Ghilardi <massimiliano.ghilardi@gmail.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    c4766560
unusual_devs.h 44.8 KB