diff options
| author | Antti Seppälä <a.seppala@gmail.com> | 2018-07-05 16:31:54 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2018-07-17 09:12:52 +0200 |
| commit | 1e111e885238bd861fd64273aab2ad1f803e34a3 (patch) | |
| tree | ca9492f1b0316c5d05e9b0f4325354cefea19484 /drivers/usb/dwc2/hcd.c | |
| parent | usb: dwc2: Fix DMA alignment to start at allocated boundary (diff) | |
| download | linux-1e111e885238bd861fd64273aab2ad1f803e34a3.tar.xz linux-1e111e885238bd861fd64273aab2ad1f803e34a3.zip | |
usb: dwc2: 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.
Taken directly from commit 0efd937e27d5e ("USB: ehci-tegra: fix inefficient
copy of unaligned buffers")
Tested with Lantiq xRX200 (MIPS) and RPi Model B Rev 2 (ARM)
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc2/hcd.c')
| -rw-r--r-- | drivers/usb/dwc2/hcd.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 2ed0ac18e053..6e2cdd7b93d4 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -2668,6 +2668,7 @@ static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg, static void dwc2_free_dma_aligned_buffer(struct urb *urb) { void *stored_xfer_buffer; + size_t length; if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) return; @@ -2676,9 +2677,14 @@ static void dwc2_free_dma_aligned_buffer(struct urb *urb) memcpy(&stored_xfer_buffer, urb->transfer_buffer + urb->transfer_buffer_length, sizeof(urb->transfer_buffer)); - if (usb_urb_dir_in(urb)) - memcpy(stored_xfer_buffer, urb->transfer_buffer, - urb->transfer_buffer_length); + if (usb_urb_dir_in(urb)) { + if (usb_pipeisoc(urb->pipe)) + length = urb->transfer_buffer_length; + else + length = urb->actual_length; + + memcpy(stored_xfer_buffer, urb->transfer_buffer, length); + } kfree(urb->transfer_buffer); urb->transfer_buffer = stored_xfer_buffer; |