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>
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@ -2512,6 +2512,7 @@ static void musb_free_temp_buffer(struct urb *urb)
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{
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enum dma_data_direction dir;
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struct musb_temp_buffer *temp;
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size_t length;
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if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
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return;
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@ -2522,8 +2523,12 @@ static void musb_free_temp_buffer(struct urb *urb)
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data);
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if (dir == DMA_FROM_DEVICE) {
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memcpy(temp->old_xfer_buffer, temp->data,
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urb->transfer_buffer_length);
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if (usb_pipeisoc(urb->pipe))
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length = urb->transfer_buffer_length;
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else
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length = urb->actual_length;
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memcpy(temp->old_xfer_buffer, temp->data, length);
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}
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urb->transfer_buffer = temp->old_xfer_buffer;
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kfree(temp->kmalloc_ptr);
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