From 83d8b688146891c6b56af59a395720b807d32915 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Thu, 6 May 2021 12:22:00 +0100 Subject: [PATCH] usb: dwc2: Fix gadget DMA unmap direction commit 75a41ce46bae6cbe7d3bb2584eb844291d642874 upstream. The dwc2 gadget support maps and unmaps DMA buffers as necessary. When mapping and unmapping it uses the direction of the endpoint to select the direction of the DMA transfer, but this fails for Control OUT transfers because the unmap occurs after the endpoint direction has been reversed for the status phase. A possible solution would be to unmap the buffer before the direction is changed, but a safer, less invasive fix is to remember the buffer direction independently of the endpoint direction. Fixes: fe0b94abcdf6 ("usb: dwc2: gadget: manage ep0 state in software") Acked-by: Minas Harutyunyan Cc: stable Signed-off-by: Phil Elwell Link: https://lore.kernel.org/r/20210506112200.2893922-1-phil@raspberrypi.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc2/core.h | 2 ++ drivers/usb/dwc2/gadget.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 3c0d386dc62f..09fd97a89eb9 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -166,6 +166,7 @@ struct dwc2_hsotg_req; * @lock: State lock to protect contents of endpoint. * @dir_in: Set to true if this endpoint is of the IN direction, which * means that it is sending data to the Host. + * @map_dir: Set to the value of dir_in when the DMA buffer is mapped. * @index: The index for the endpoint registers. * @mc: Multi Count - number of transactions per microframe * @interval - Interval for periodic endpoints, in frames or microframes. @@ -214,6 +215,7 @@ struct dwc2_hsotg_ep { unsigned short fifo_index; unsigned char dir_in; + unsigned char map_dir; unsigned char index; unsigned char mc; u16 interval; diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index aab2f6cbd524..6790c0a18123 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -413,7 +413,7 @@ static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg, { struct usb_request *req = &hs_req->req; - usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->dir_in); + usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->map_dir); } /* @@ -1213,6 +1213,7 @@ static int dwc2_hsotg_map_dma(struct dwc2_hsotg *hsotg, { int ret; + hs_ep->map_dir = hs_ep->dir_in; ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in); if (ret) goto dma_error; -- 2.20.1