Commit 8ca9a321 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

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: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a8425292
......@@ -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);
......
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