• David Brownell's avatar
    [PATCH] USB: ehci-hcd, minor hardware tweaks · af697798
    David Brownell authored
    This tweaks the hardware in two minor ways, being more forgiving
    of what are either hardware bugs or hard-to-see driver bugs.
    
      - Some silicon seems to mis-handle dummy qtds on occasion,
        writing them into the qh and thus stopping progress unless
        something times it out and cancels it (scsi-eh etc).
    
        This initializes such qtds slightly differently, so some
        such cases will make the driver automatically recover, and
        so all such errors will fail in the same way.
    
      - In case of dodgy behavior with respect to unlinking, don't
        modify a field.  Silicon that's (wrongly) reading this will
        have a chance to read the old value while it's still valid.
    
    Also minor diagnostic tweaks for better uniformity/usability.
    af697798
ehci-mem.c 6.38 KB