usb: musb: honour the return value of dma_map_single()

Since dma_map_single() may fail it is good to actually check the return
code to see if it succeeded.

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

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 4376f51..696e9e0 100644 (file)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -76,13 +76,21 @@ static inline void map_dma_buffer(struct musb_request *request,
                return;
 
        if (request->request.dma == DMA_ADDR_INVALID) {
-               request->request.dma = dma_map_single(
+               dma_addr_t dma_addr;
+               int ret;
+
+               dma_addr = dma_map_single(
                                musb->controller,
                                request->request.buf,
                                request->request.length,
                                request->tx
                                        ? DMA_TO_DEVICE
                                        : DMA_FROM_DEVICE);
+               ret = dma_mapping_error(musb->controller, dma_addr);
+               if (ret)
+                       return;
+
+               request->request.dma = dma_addr;
                request->map_state = MUSB_MAPPED;
        } else {
                dma_sync_single_for_device(musb->controller,