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usb: cdns3: optimize OUT transfer by copying only actual received data

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Previously, the entire length of the request, which is equal to or greater
than the actual data, was dma synced and memcpy when using the bounce
buffer. Actually only the actual data indicated by request->actual need be
synced and copied.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20230518204947.3770236-2-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Li
2023-05-18 16:49:46 -04:00
committed by Greg Kroah-Hartman
parent 2a1c4639d6
commit 3124387537
1 changed files with 2 additions and 2 deletions
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drivers/usb/cdns3/cdns3-gadget.c
+2 -2
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@@ -809,10 +809,10 @@ void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
/* Make DMA buffer CPU accessible */
dma_sync_single_for_cpu(priv_dev->sysdev,
priv_req->aligned_buf->dma,
priv_req->aligned_buf->size,
request->actual,
priv_req->aligned_buf->dir);
memcpy(request->buf, priv_req->aligned_buf->buf,
request->length);
request->actual);
}
priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED);