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    Subject[PATCH 4.4 054/103] usb: host: xhci-mem: allocate zeroed Scratchpad Buffer
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Peter Chen <peter.chen@nxp.com>

    commit 7480d912d549f414e0ce39331870899e89a5598c upstream.

    According to xHCI ch4.20 Scratchpad Buffers, the Scratchpad
    Buffer needs to be zeroed.

    ...
    The following operations take place to allocate
    Scratchpad Buffers to the xHC:
    ...
    b. Software clears the Scratchpad Buffer to '0'

    Signed-off-by: Peter Chen <peter.chen@nxp.com>
    Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/host/xhci-mem.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/usb/host/xhci-mem.c
    +++ b/drivers/usb/host/xhci-mem.c
    @@ -1709,7 +1709,7 @@ static int scratchpad_alloc(struct xhci_
    xhci->dcbaa->dev_context_ptrs[0] = cpu_to_le64(xhci->scratchpad->sp_dma);
    for (i = 0; i < num_sp; i++) {
    dma_addr_t dma;
    - void *buf = dma_alloc_coherent(dev, xhci->page_size, &dma,
    + void *buf = dma_zalloc_coherent(dev, xhci->page_size, &dma,
    flags);
    if (!buf)
    goto fail_sp5;

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