usb: gadget: fusb300_udc: fix compile warnings

- remove pointer u32 abuse in fusb300_fill_idma_prdtbl().
  It is assigned the dma_addr to a pointer and then back.
  Poor families may have to recycle variables but we don't

- don't free req.buf in error case. We don't do it in the
  ok case so it is probably wrong to do it in error case.

- return in error case. There is no reason to continue
  without data and performing ops on an invalid pointer.

- The if (d) statement is bogus since an invalid DMA pointer
  is ~0 on some architecutres. And since we return for the
  invalid case we don't need it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 7 insertions, 15 deletions

diff --git a/drivers/usb/gadget/fusb300_udc.c b/drivers/usb/gadget/fusb300_udc.c
index 4739f5baa363..24a924330c81 100644
--- a/drivers/usb/gadget/fusb300_udc.c
+++ b/drivers/usb/gadget/fusb300_udc.c
@@ -997,8 +997,8 @@ static void done(struct fusb300_ep *ep, struct fusb300_request *req,
                 fusb300_set_cxdone(ep->fusb300);
 }
 
-void fusb300_fill_idma_prdtbl(struct fusb300_ep *ep,
-                        struct fusb300_request *req)
+static void fusb300_fill_idma_prdtbl(struct fusb300_ep *ep, dma_addr_t d,
+                u32 len)
 {
         u32 value;
         u32 reg;
@@ -1010,10 +1010,9 @@ void fusb300_fill_idma_prdtbl(struct fusb300_ep *ep,
                 reg &= FUSB300_EPPRD0_H;
         } while (reg);
 
-        iowrite32((u32) req->req.buf, ep->fusb300->reg +
-                FUSB300_OFFSET_EPPRD_W1(ep->epnum));
+        iowrite32(d, ep->fusb300->reg + FUSB300_OFFSET_EPPRD_W1(ep->epnum));
 
-        value = FUSB300_EPPRD0_BTC(req->req.length) | FUSB300_EPPRD0_H |
+        value = FUSB300_EPPRD0_BTC(len) | FUSB300_EPPRD0_H |
                 FUSB300_EPPRD0_F | FUSB300_EPPRD0_L | FUSB300_EPPRD0_I;
         iowrite32(value, ep->fusb300->reg + FUSB300_OFFSET_EPPRD_W0(ep->epnum));
 
@@ -1050,13 +1049,12 @@ static void  fusb300_set_idma(struct fusb300_ep *ep,
                         struct fusb300_request *req)
 {
         dma_addr_t d;
-        u8 *tmp = NULL;
 
         d = dma_map_single(NULL, req->req.buf, req->req.length, DMA_TO_DEVICE);
 
         if (dma_mapping_error(NULL, d)) {
-                kfree(req->req.buf);
                 printk(KERN_DEBUG "dma_mapping_error\n");
+                return;
         }
 
         dma_sync_single_for_device(NULL, d, req->req.length, DMA_TO_DEVICE);
@@ -1064,17 +1062,11 @@ static void  fusb300_set_idma(struct fusb300_ep *ep,
         fusb300_enable_bit(ep->fusb300, FUSB300_OFFSET_IGER0,
                 FUSB300_IGER0_EEPn_PRD_INT(ep->epnum));
 
-        tmp = req->req.buf;
-        req->req.buf = (u8 *)d;
-
-        fusb300_fill_idma_prdtbl(ep, req);
+        fusb300_fill_idma_prdtbl(ep, d, req->req.length);
         /* check idma is done */
         fusb300_wait_idma_finished(ep);
 
-        req->req.buf = tmp;
-
-        if (d)
-                dma_unmap_single(NULL, d, req->req.length, DMA_TO_DEVICE);
+        dma_unmap_single(NULL, d, req->req.length, DMA_TO_DEVICE);
 }
 
 static void in_ep_fifo_handler(struct fusb300_ep *ep)