usb: dwc2: Fix gadget DMA unmap direction

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 <Minas.Harutyunyan@synopsys.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Link: https://lore.kernel.org/r/20210506112200.2893922-1-phil@raspberrypi.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index da5ac4a4595b6c7b2133d12b62885adefcdc7c1f..ab6b815e0089ca1196fb6bf6911387154fc24bf1 100644 (file)
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -113,6 +113,7 @@ struct dwc2_hsotg_req;
  * @debugfs: File entry for debugfs file for this 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.
@@ -162,6 +163,7 @@ 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 e6bb1bdb2760390592a42cd7423b19b3395e06ee..184964174dc0c0f1723b6376c495ee862e94b2d4 100644 (file)
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -422,7 +422,7 @@ 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);
 }
 
 /*
@@ -1242,6 +1242,7 @@ 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;