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usb: musb: gadget: do *unmap_dma_buffer* only for valid DMA addr

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musb does not use DMA buffer for ep0 but it uses the same giveback
function *musb_g_giveback* for all endpoints (*musb_g_ep0_giveback* calls
*musb_g_giveback*). So for ep0 case request.dma will be '0'
and will result in kernel OOPS if tried to *unmap_dma_buffer* for requests in
ep0. Fixed it by doing *unmap_dma_buffer* only for valid DMA addr and
checking that musb_ep->dma is valid when unmapping.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2013-03-15 18:58:50 +05:30 committed by Felipe Balbi
parent 273daf2f2a
commit 06d9db7273
1 changed files with 7 additions and 2 deletions
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7
drivers/usb/musb/musb_gadget.c
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@ -141,7 +141,9 @@ static inline void map_dma_buffer(struct musb_request *request,
static inline void unmap_dma_buffer(struct musb_request *request,
struct musb *musb)
{
if (!is_buffer_mapped(request))
struct musb_ep *musb_ep = request->ep;
if (!is_buffer_mapped(request) || !musb_ep->dma)
return;
if (request->request.dma == DMA_ADDR_INVALID) {
@ -195,7 +197,10 @@ __acquires(ep->musb->lock)
ep->busy = 1;
spin_unlock(&musb->lock);
if (!dma_mapping_error(&musb->g.dev, request->dma))
unmap_dma_buffer(req, musb);
if (request->status == 0)
dev_dbg(musb->controller, "%s done request %p, %d/%d\n",
ep->end_point.name, request,