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>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 4376f51f5ef1..696e9e0b05af 100644
--- 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,