• Gavin Guo's avatar
    usb: Check if port status is equal to RxDetect · bb86cf56
    Gavin Guo authored
    When using USB 3.0 pen drive with the [AMD] FCH USB XHCI Controller
    [1022:7814], the second hotplugging will experience the USB 3.0 pen
    drive is recognized as high-speed device. After bisecting the kernel,
    I found the commit number 41e7e056
    (USB: Allow USB 3.0 ports to be disabled.) causes the bug. After doing
    some experiments, the bug can be fixed by avoiding executing the function
    hub_usb3_port_disable(). Because the port status with [AMD] FCH USB
    XHCI Controlleris [1022:7814] is already in RxDetect
    (I tried printing out the port status before setting to Disabled state),
    it's reasonable to check the port status before really executing
    hub_usb3_port_disable().
    
    Fixes: 41e7e056
    
     (USB: Allow USB 3.0 ports to be disabled.)
    Signed-off-by: default avatarGavin Guo <gavin.guo@canonical.com>
    Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    bb86cf56
hub.c 161 KB