2011/3/22 Roedel, Joerg <Joerg.Roedel@xxxxxxx>: > On Mon, Mar 21, 2011 at 05:03:15PM -0400, Florian Mickler wrote: >> I guess (not verified), that the dma api takes sufficient precautions >> to abort the dma transfer if a timeout happens. So freeing _should_ >> not be an issue. (At least, I would expect big fat warnings everywhere >> if that were the case) > > Freeing is very well an issue. All you can expect from the DMA-API is to > give you a valid DMA handle for your device. But it can not prevent that > a device uses this handle after you returned it. You need to make sure > yourself that any pending DMA is canceled before calling kfree(). sorry, I meant usb_control_msg above when I said 'dma api'... as that is the function these drivers use to do the dma. Regards, Flo -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
