On Fri, Mar 01, 2013 at 03:42:26PM +0100, Michael Grzeschik wrote:
> Instead of having a limited number of usable tds in the udc we use a
> linked list to support dynamic amount of needed tds for all special
> gadget types. This improves throughput.
>
> This patch also adresses a possible momory leak in _ep_nuke found
> while porting the request handling to an linked list.
>
> - The call of _ep_nuke can lead to an memory leak, if it is called on an
> endpoint with currently dynamic allocated tds. This was aswell a
> problem
> in the special case before the dynamic td handling was implemented and
> an zero length packet was added to mark the end of the transfer.
It is another problem, better have another commit, besides, can you
describe more detail?
> +
> +static int add_td_to_list(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq,
> unsigned length)
> +{
> + struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
> GFP_ATOMIC);
Better split above one line to two lines like below "dma_pool_alloc"
> +
> + if (node == NULL)
> + return -ENOMEM;
> +
> + node->ptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
> + &node->dma);
> + if (node->ptr == NULL) {
> + kfree(node);
> + return -ENOMEM;
> + }
> +
> + setup_td_bits(node, length);
> +
> + /* get the last entry */
> + lastnode = list_entry(mReq->tds.prev,
> + struct td_node, td);
> + lastnode->ptr->next = node->dma;
> +
> + INIT_LIST_HEAD(&node->td);
> + list_add_tail(&node->td, &mReq->tds);
> +
> + return 0;
> +}
> +
> /**
--
Best Regards,
Peter Chen
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