usb: host: xhci: delete sp_dma_buffers for scratchpad

We already have sp_array to store each scratch buffer address for xHC,
it doesn't need another sp_dma_buffers array to store it.
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

@@ -1721,36 +1721,27 @@ static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
 	if (!xhci->scratchpad->sp_buffers)
 		goto fail_sp3;
 
-	xhci->scratchpad->sp_dma_buffers =
-		kzalloc(sizeof(dma_addr_t) * num_sp, flags);
-
-	if (!xhci->scratchpad->sp_dma_buffers)
-		goto fail_sp4;
-
 	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,
 				flags);
 		if (!buf)
-			goto fail_sp5;
+			goto fail_sp4;
 
 		xhci->scratchpad->sp_array[i] = dma;
 		xhci->scratchpad->sp_buffers[i] = buf;
-		xhci->scratchpad->sp_dma_buffers[i] = dma;
 	}
 
 	return 0;
 
- fail_sp5:
+ fail_sp4:
 	for (i = i - 1; i >= 0; i--) {
 		dma_free_coherent(dev, xhci->page_size,
 				    xhci->scratchpad->sp_buffers[i],
-				    xhci->scratchpad->sp_dma_buffers[i]);
+				    xhci->scratchpad->sp_array[i]);
 	}
-	kfree(xhci->scratchpad->sp_dma_buffers);
 
- fail_sp4:
 	kfree(xhci->scratchpad->sp_buffers);
 
  fail_sp3:
@@ -1780,9 +1771,8 @@ static void scratchpad_free(struct xhci_hcd *xhci)
 	for (i = 0; i < num_sp; i++) {
 		dma_free_coherent(dev, xhci->page_size,
 				    xhci->scratchpad->sp_buffers[i],
-				    xhci->scratchpad->sp_dma_buffers[i]);
+				    xhci->scratchpad->sp_array[i]);
 	}
-	kfree(xhci->scratchpad->sp_dma_buffers);
 	kfree(xhci->scratchpad->sp_buffers);
 	dma_free_coherent(dev, num_sp * sizeof(u64),
 			    xhci->scratchpad->sp_array,

drivers/usb/host/xhci.h

@@ -1606,7 +1606,6 @@ struct xhci_scratchpad {
 	u64 *sp_array;
 	dma_addr_t sp_dma;
 	void **sp_buffers;
-	dma_addr_t *sp_dma_buffers;
 };
 
 struct urb_priv {