staging: dwc2: fix some functions to return a proper error code

Fix some functions called by dwc2_hcd_qtd_add() to return either
a proper error code or 0, instead of somewhat random values.
Then change the caller of dwc2_hcd_qtd_add() to just check the
return value for 0.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dwc2/hcd.c b/drivers/staging/dwc2/hcd.c
index 3cfd2d5..24a4efe 100644 (file)
--- a/drivers/staging/dwc2/hcd.c
+++ b/drivers/staging/dwc2/hcd.c
@@ -369,7 +369,7 @@ static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
        dwc2_hcd_qtd_init(qtd, urb);
        retval = dwc2_hcd_qtd_add(hsotg, qtd, (struct dwc2_qh **)ep_handle,
                                  mem_flags);
-       if (retval < 0) {
+       if (retval) {
                dev_err(hsotg->dev,
                        "DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n",
                        retval);
@@ -378,7 +378,7 @@ static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
        }
 
        intr_mask = readl(hsotg->regs + GINTMSK);
-       if (!(intr_mask & GINTSTS_SOF) && retval == 0) {
+       if (!(intr_mask & GINTSTS_SOF)) {
                enum dwc2_transaction_type tr_type;
 
                if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
@@ -396,7 +396,7 @@ static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }
 
-       return retval;
+       return 0;
 }
 
 /* Must be called with interrupt disabled and spinlock held */

diff --git a/drivers/staging/dwc2/hcd_queue.c b/drivers/staging/dwc2/hcd_queue.c
index 2f68fbc..729cc0b 100644 (file)
--- a/drivers/staging/dwc2/hcd_queue.c
+++ b/drivers/staging/dwc2/hcd_queue.c
@@ -354,7 +354,7 @@ static int dwc2_find_single_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
                        return i;
                }
        }
-       return -1;
+       return -ENOSPC;
 }
 
 /*
@@ -413,7 +413,7 @@ static int dwc2_find_multi_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
                                continue;
                }
        }
-       return -1;
+       return -ENOSPC;
 }
 
 static int dwc2_find_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
@@ -487,12 +487,12 @@ static int dwc2_schedule_periodic(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
                        frame = status - 1;
 
                /* Set the new frame up */
-               if (frame > -1) {
+               if (frame >= 0) {
                        qh->sched_frame &= ~0x7;
                        qh->sched_frame |= (frame & 7);
                }
 
-               if (status != -1)
+               if (status > 0)
                        status = 0;
        } else {
                status = dwc2_periodic_channel_available(hsotg);