Messages in this thread Patch in this message | | | From | Kishon Vijay Abraham I <> | Subject | [PATCH 2/4] usb: musb: gadget: do *unmap_dma_buffer* only for valid DMA addr | Date | Fri, 15 Mar 2013 18:58:50 +0530 |
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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.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> --- drivers/usb/musb/musb_gadget.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index c454375..ec3cf29 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -107,7 +107,10 @@ __acquires(ep->musb->lock) ep->busy = 1; spin_unlock(&musb->lock); - unmap_dma_buffer(req, musb); + + if (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, -- 1.7.10.4
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