usb: dwc2: host: fix the data toggle error in full speed descriptor dma

There will be data toggle error happen for full speed buld-out transfer.
The data toggle bit is saved in qh for non-control transfers, it is wrong
to  check the qtd for that case.

Also fix one static analysis tool issue after fix the data toggle error.

John Youn:
* Added WARN() to warn on improper usage of the
  dwc2_hcd_save_data_toggle() function.

Signed-off-by: Dyson Lee <dyson.lee@intel.com>
Signed-off-by: Tang, Jianqiang <jianqiang.tang@intel.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/dwc2/hcd_ddma.c b/drivers/usb/dwc2/hcd_ddma.c
index 89db47a..a41274a 100644 (file)
--- a/drivers/usb/dwc2/hcd_ddma.c
+++ b/drivers/usb/dwc2/hcd_ddma.c
@@ -1257,7 +1257,7 @@ stop_scan:
                 */
                if (halt_status == DWC2_HC_XFER_STALL)
                        qh->data_toggle = DWC2_HC_PID_DATA0;
-               else if (qtd)
+               else
                        dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
        }
 

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index f825380..cadba8b 100644 (file)
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -525,11 +525,19 @@ void dwc2_hcd_save_data_toggle(struct dwc2_hsotg *hsotg,
        u32 pid = (hctsiz & TSIZ_SC_MC_PID_MASK) >> TSIZ_SC_MC_PID_SHIFT;
 
        if (chan->ep_type != USB_ENDPOINT_XFER_CONTROL) {
+               if (WARN(!chan || !chan->qh,
+                        "chan->qh must be specified for non-control eps\n"))
+                       return;
+
                if (pid == TSIZ_SC_MC_PID_DATA0)
                        chan->qh->data_toggle = DWC2_HC_PID_DATA0;
                else
                        chan->qh->data_toggle = DWC2_HC_PID_DATA1;
        } else {
+               if (WARN(!qtd,
+                        "qtd must be specified for control eps\n"))
+                       return;
+
                if (pid == TSIZ_SC_MC_PID_DATA0)
                        qtd->data_toggle = DWC2_HC_PID_DATA0;
                else