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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>
This commit is contained in:
Sebastian Andrzej Siewior 2013-08-13 19:35:43 +02:00 committed by Felipe Balbi
parent 5a68e9b57b
commit 7b360f4287
1 changed files with 9 additions and 1 deletions
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10
drivers/usb/musb/musb_gadget.c
View File

@ -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,