tree e5b56ace01d240c49b1acbdc02f17cf6a2102fdc
parent 7dd19e69d131ea34f74397559b422511e54d2911
author Sarah Sharp <sarah.a.sharp@linux.intel.com> 1242326654 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1245127491 -0700

usb; xhci: Fix TRB offset calculations.

Greg KH introduced a bug into xhci_trb_virt_to_dma() when he changed the
type of offset to dma_addr_t from unsigned int and dropped the casts to
unsigned int around the virtual address pointer subtraction.

trb and seg->trbs are both valid pointers to virtual addresses, so the
compiler will mod the subtraction by the size of union trb (16 bytes).
segment_offset is an unsigned long, which is guaranteed to be at least as
big as a void *.

Drop the void * casts in the first if statement because trb and seg->trbs
are both pointers of the same type (pointers to union trb).

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>