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Date: Wed, 04 Nov 2015 12:02:31 +0100
From: Robert Baldyga <r.baldyga@...sung.com>
To: Felipe Ferreri Tonello <eu@...ipetonello.com>, balbi@...com
Cc: gregkh@...uxfoundation.org, andrzej.p@...sung.com,
m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/23] usb: gadget: f_loopback: free requests in
loopback_disable()
On 11/04/2015 11:15 AM, Felipe Ferreri Tonello wrote:
> Hi Robert,
>
> On 03/11/15 12:53, Robert Baldyga wrote:
>> USB requests in Loopback function are allocated in loopback_get_alt()
>> function, so we prefer to free them rather in loopback_disable() than
>> in loopback_complete() when request is completed with error. It provides
>> better symetry in resource management and improves code readability.
>
> Are we doing this for all functions? Because I see that several
> functions does the same thing, they free IN/OUT ep requests on
> complete() instead of disable().
>
> I also prefer this, but then we need to refactor most function code.
>
I'm planning to convert all USB Functions to new API anyway, which
involves lots of refactoring, so it can be done en passant. Moreover
patch 14 of this series introduces clear_alt() operation, which is more
suitable place to free resources allocated in set_alt().
Thanks,
Robert Baldyga
>>
>> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
>> ---
>> drivers/usb/gadget/function/f_loopback.c | 58 +++++++++++++-------------------
>> 1 file changed, 23 insertions(+), 35 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/function/f_loopback.c b/drivers/usb/gadget/function/f_loopback.c
>> index 6b2102b..41464ae 100644
>> --- a/drivers/usb/gadget/function/f_loopback.c
>> +++ b/drivers/usb/gadget/function/f_loopback.c
>> @@ -35,6 +35,9 @@ struct f_loopback {
>> struct usb_ep *in_ep;
>> struct usb_ep *out_ep;
>>
>> + struct usb_request *in_req;
>> + struct usb_request *out_req;
>> +
>> unsigned qlen;
>> unsigned buflen;
>> };
>> @@ -249,30 +252,25 @@ static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
>> * We received some data from the host so let's
>> * queue it so host can read the from our in ep
>> */
>> - struct usb_request *in_req = req->context;
>> -
>> - in_req->zero = (req->actual < req->length);
>> - in_req->length = req->actual;
>> + loop->in_req->zero = (req->actual < req->length);
>> + loop->in_req->length = req->actual;
>> + req = loop->in_req;
>> ep = loop->in_ep;
>> - req = in_req;
>> } else {
>> /*
>> * We have just looped back a bunch of data
>> * to host. Now let's wait for some more data.
>> */
>> - req = req->context;
>> + req = loop->out_req;
>> ep = loop->out_ep;
>> }
>>
>> /* queue the buffer back to host or for next bunch of data */
>> status = usb_ep_queue(ep, req, GFP_ATOMIC);
>> - if (status == 0) {
>> - return;
>> - } else {
>> + if (status < 0)
>> ERROR(cdev, "Unable to loop back buffer to %s: %d\n",
>> ep->name, status);
>> - goto free_req;
>> - }
>> + break;
>>
>> /* "should never get here" */
>> default:
>> @@ -280,20 +278,10 @@ static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
>> status, req->actual, req->length);
>> /* FALLTHROUGH */
>>
>> - /* NOTE: since this driver doesn't maintain an explicit record
>> - * of requests it submitted (just maintains qlen count), we
>> - * rely on the hardware driver to clean up on disconnect or
>> - * endpoint disable.
>> - */
>> case -ECONNABORTED: /* hardware forced ep reset */
>> case -ECONNRESET: /* request dequeued */
>> case -ESHUTDOWN: /* disconnect from host */
>> -free_req:
>> - usb_ep_free_request(ep == loop->in_ep ?
>> - loop->out_ep : loop->in_ep,
>> - req->context);
>> - free_ep_req(ep, req);
>> - return;
>> + break;
>> }
>> }
>>
>> @@ -316,7 +304,6 @@ static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len)
>> static int alloc_requests(struct usb_composite_dev *cdev,
>> struct f_loopback *loop)
>> {
>> - struct usb_request *in_req, *out_req;
>> int i;
>> int result = 0;
>>
>> @@ -329,23 +316,21 @@ static int alloc_requests(struct usb_composite_dev *cdev,
>> for (i = 0; i < loop->qlen && result == 0; i++) {
>> result = -ENOMEM;
>>
>> - in_req = usb_ep_alloc_request(loop->in_ep, GFP_KERNEL);
>> - if (!in_req)
>> + loop->in_req = usb_ep_alloc_request(loop->in_ep, GFP_KERNEL);
>> + if (!loop->in_req)
>> goto fail;
>>
>> - out_req = lb_alloc_ep_req(loop->out_ep, 0);
>> - if (!out_req)
>> + loop->out_req = lb_alloc_ep_req(loop->out_ep, 0);
>> + if (!loop->out_req)
>> goto fail_in;
>>
>> - in_req->complete = loopback_complete;
>> - out_req->complete = loopback_complete;
>> + loop->in_req->complete = loopback_complete;
>> + loop->out_req->complete = loopback_complete;
>>
>> - in_req->buf = out_req->buf;
>> + loop->in_req->buf = loop->out_req->buf;
>> /* length will be set in complete routine */
>> - in_req->context = out_req;
>> - out_req->context = in_req;
>>
>> - result = usb_ep_queue(loop->out_ep, out_req, GFP_ATOMIC);
>> + result = usb_ep_queue(loop->out_ep, loop->out_req, GFP_ATOMIC);
>> if (result) {
>> ERROR(cdev, "%s queue req --> %d\n",
>> loop->out_ep->name, result);
>> @@ -356,9 +341,9 @@ static int alloc_requests(struct usb_composite_dev *cdev,
>> return 0;
>>
>> fail_out:
>> - free_ep_req(loop->out_ep, out_req);
>> + free_ep_req(loop->out_ep, loop->out_req);
>> fail_in:
>> - usb_ep_free_request(loop->in_ep, in_req);
>> + usb_ep_free_request(loop->in_ep, loop->in_req);
>> fail:
>> return result;
>> }
>> @@ -426,6 +411,9 @@ static void loopback_disable(struct usb_function *f)
>> struct f_loopback *loop = func_to_loop(f);
>>
>> disable_loopback(loop);
>> +
>> + free_ep_req(loop->out_ep, loop->out_req);
>> + usb_ep_free_request(loop->in_ep, loop->in_req);
>> }
>>
>> static struct usb_function *loopback_alloc(struct usb_function_instance *fi)
>>
>
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