From: Johan Hovold <johan@kernel.org>
Date: Thu, 23 Apr 2015 14:06:50 +0000 (+0200)
Subject: usb: musb: fix inefficient copy of unaligned buffers
X-Git-Tag: v4.2-rc1~86^2~16^2~93
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d72348fb5ca634583bf3f79996cc4b3ef91d9c3a;p=platform%2Fkernel%2Flinux-exynos.git

usb: musb: fix inefficient copy of unaligned buffers

Make sure only to copy any actual data rather than the whole buffer,
when releasing the temporary buffer used for unaligned non-isochronous
transfers.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index c3d5fc9..e1fb5d8 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -2512,6 +2512,7 @@ static void musb_free_temp_buffer(struct urb *urb)
 {
 	enum dma_data_direction dir;
 	struct musb_temp_buffer *temp;
+	size_t length;
 
 	if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
 		return;
@@ -2522,8 +2523,12 @@ static void musb_free_temp_buffer(struct urb *urb)
 			    data);
 
 	if (dir == DMA_FROM_DEVICE) {
-		memcpy(temp->old_xfer_buffer, temp->data,
-		       urb->transfer_buffer_length);
+		if (usb_pipeisoc(urb->pipe))
+			length = urb->transfer_buffer_length;
+		else
+			length = urb->actual_length;
+
+		memcpy(temp->old_xfer_buffer, temp->data, length);
 	}
 	urb->transfer_buffer = temp->old_xfer_buffer;
 	kfree(temp->kmalloc_ptr);