diff options
| author | Johan Hovold <johan@kernel.org> | 2015-04-23 16:06:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-08 01:43:44 +0200 |
| commit | 8ca9a3217f0ac35e8595bf203685a2205213ddc8 (patch) | |
| tree | 072e2651428fbcfba2aab7e9366541b2827a0cac /drivers | |
| parent | a8425292816ceaa8c49e29d2114e85d85a73e080 (diff) | |
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index c3d5fc9dfb5b..e1fb5d885c18 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); |