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usb: chipidea: udc: move _ep_queue into an unlocked function

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There is no need to call ep_queue unlocked inside the own driver. We
move its functionionality into an unlocked version.

This patch removes potential unlocked timeslots inside
isr_setup_status_phase and isr_get_status_response, in which the lock
got released just before acquired again inside usb_ep_queue.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Reviewed-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik 2013-03-30 12:54:09 +02:00 committed by Greg Kroah-Hartman
parent 24dcade163
commit dd064e9d36
1 changed files with 56 additions and 48 deletions
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104
drivers/usb/chipidea/udc.c
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@ -642,6 +642,59 @@ static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
usb_ep_free_request(ep, req);
}
/**
* _ep_queue: queues (submits) an I/O request to an endpoint
*
* Caller must hold lock
*/
static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
gfp_t __maybe_unused gfp_flags)
{
struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
struct ci13xxx *ci = mEp->ci;
int retval = 0;
if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
return -EINVAL;
if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
if (req->length)
mEp = (ci->ep0_dir == RX) ?
ci->ep0out : ci->ep0in;
if (!list_empty(&mEp->qh.queue)) {
_ep_nuke(mEp);
retval = -EOVERFLOW;
dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
_usb_addr(mEp));
}
}
/* first nuke then test link, e.g. previous status has not sent */
if (!list_empty(&mReq->queue)) {
dev_err(mEp->ci->dev, "request already in queue\n");
return -EBUSY;
}
if (req->length > 4 * CI13XXX_PAGE_SIZE) {
dev_err(mEp->ci->dev, "request bigger than one td\n");
return -EMSGSIZE;
}
/* push request */
mReq->req.status = -EINPROGRESS;
mReq->req.actual = 0;
retval = _hardware_enqueue(mEp, mReq);
if (retval == -EALREADY)
retval = 0;
if (!retval)
list_add_tail(&mReq->queue, &mEp->qh.queue);
return retval;
}
/**
* isr_get_status_response: get_status request response
* @ci: ci struct
@ -689,9 +742,7 @@ __acquires(mEp->lock)
}
/* else do nothing; reserved for future use */
spin_unlock(mEp->lock);
retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
spin_lock(mEp->lock);
retval = _ep_queue(&mEp->ep, req, gfp_flags);
if (retval)
goto err_free_buf;
@ -738,8 +789,6 @@ isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
* This function returns an error code
*/
static int isr_setup_status_phase(struct ci13xxx *ci)
__releases(mEp->lock)
__acquires(mEp->lock)
{
int retval;
struct ci13xxx_ep *mEp;
@ -748,9 +797,7 @@ __acquires(mEp->lock)
ci->status->context = ci;
ci->status->complete = isr_setup_status_complete;
spin_unlock(mEp->lock);
retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
spin_lock(mEp->lock);
retval = _ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
return retval;
}
@ -1128,8 +1175,6 @@ static int ep_queue(struct usb_ep *ep, struct usb_request *req,
gfp_t __maybe_unused gfp_flags)
{
struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
struct ci13xxx *ci = mEp->ci;
int retval = 0;
unsigned long flags;
@ -1137,44 +1182,7 @@ static int ep_queue(struct usb_ep *ep, struct usb_request *req,
return -EINVAL;
spin_lock_irqsave(mEp->lock, flags);
if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
if (req->length)
mEp = (ci->ep0_dir == RX) ?
ci->ep0out : ci->ep0in;
if (!list_empty(&mEp->qh.queue)) {
_ep_nuke(mEp);
retval = -EOVERFLOW;
dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
_usb_addr(mEp));
}
}
/* first nuke then test link, e.g. previous status has not sent */
if (!list_empty(&mReq->queue)) {
retval = -EBUSY;
dev_err(mEp->ci->dev, "request already in queue\n");
goto done;
}
if (req->length > 4 * CI13XXX_PAGE_SIZE) {
retval = -EMSGSIZE;
dev_err(mEp->ci->dev, "request bigger than one td\n");
goto done;
}
/* push request */
mReq->req.status = -EINPROGRESS;
mReq->req.actual = 0;
retval = _hardware_enqueue(mEp, mReq);
if (retval == -EALREADY)
retval = 0;
if (!retval)
list_add_tail(&mReq->queue, &mEp->qh.queue);
done:
retval = _ep_queue(ep, req, gfp_flags);
spin_unlock_irqrestore(mEp->lock, flags);
return retval;
}