Use dma_poll_zalloc() instead of explicit memset() call in
xhci_alloc_stream_ctx(). Note, that dma_alloc_coherent() is
always issues zeroed memory chunk.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/usb/host/xhci-mem.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c385513ad00b..4ffa6495878d 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -575,10 +575,10 @@ static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
 		return dma_alloc_coherent(dev, size,
 				dma, mem_flags);
 	else if (size <= SMALL_STREAM_ARRAY_SIZE)
-		return dma_pool_alloc(xhci->small_streams_pool,
+		return dma_pool_zalloc(xhci->small_streams_pool,
 				mem_flags, dma);
 	else
-		return dma_pool_alloc(xhci->medium_streams_pool,
+		return dma_pool_zalloc(xhci->medium_streams_pool,
 				mem_flags, dma);
 }
 
@@ -643,8 +643,6 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
 			mem_flags);
 	if (!stream_info->stream_ctx_array)
 		goto cleanup_ring_array;
-	memset(stream_info->stream_ctx_array, 0,
-			sizeof(struct xhci_stream_ctx)*num_stream_ctxs);
 
 	/* Allocate everything needed to free the stream rings later */
 	stream_info->free_streams_command =
-- 
2.39.1