diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2011-08-31 17:12:02 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2011-09-09 13:03:46 +0300 |
| commit | 78c58a53c9864447f2a46d4c06dd3c2616823ad2 (patch) | |
| tree | 1827737dc8434619b7c1f9e673b491cb5e71c0ff | |
| parent | 42077b0a3328792974b232691f5d0eb9dd644768 (diff) | |
usb: dwc3: gadget: do not map/unmap ZLP transfers
If the gadget drivers sends a ZLP we are trying to map this this request
which does not work on all implementations. So we simply skip mapping
it.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 0c934a195deb..1de4d3f87569 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -61,6 +61,11 @@ void dwc3_map_buffer_to_dma(struct dwc3_request *req) { struct dwc3 *dwc = req->dep->dwc; + if (req->request.length == 0) { + /* req->request.dma = dwc->setup_buf_addr; */ + return; + } + if (req->request.dma == DMA_ADDR_INVALID) { req->request.dma = dma_map_single(dwc->dev, req->request.buf, req->request.length, req->direction @@ -78,6 +83,11 @@ void dwc3_unmap_buffer_from_dma(struct dwc3_request *req) { struct dwc3 *dwc = req->dep->dwc; + if (req->request.length == 0) { + req->request.dma = DMA_ADDR_INVALID; + return; + } + if (req->mapped) { dma_unmap_single(dwc->dev, req->request.dma, req->request.length, req->direction |