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Commit 7a7e7896 authored by Martin Fuzzey's avatar Martin Fuzzey Committed by Greg Kroah-Hartman
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USB: imx21-hcd: Fix isochronous endpoint idle 



Release the hardware resources and reset the internal HCD state
associated with an isochronous endpoint when the last URB queued
for it completes.

Previously this was only done in then endpoint_disable() method
causing usbtest 15 and 16 to hang when run twice in succession
without a disconnect.

Signed-off-by: default avatarMartin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent b2a068d0

drivers/usb/host/imx21-hcd.c

+39 −17
Original line number Diff line number Diff line
@@ -390,15 +390,19 @@ static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb); 
/* Endpoint now idle - release it's ETD(s) or asssign to queued request */

static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)

{

	int etd_num;

	int i;



	for (i = 0; i < NUM_ISO_ETDS; i++) {

		etd_num = ep_priv->etd[i];

		int etd_num = ep_priv->etd[i];

		struct etd_priv *etd;

		if (etd_num < 0)

			continue;



		etd = &imx21->etd[etd_num];

		ep_priv->etd[i] = -1;



		free_dmem(imx21, etd); /* for isoc */



		if (list_empty(&imx21->queue_for_etd)) {

			free_etd(imx21, etd_num);

			continue;
@@ -576,30 +580,43 @@ static struct ep_priv *alloc_isoc_ep( 
	int i;



	ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);

	if (ep_priv == NULL)

	if (!ep_priv)

		return NULL;



	/* Allocate the ETDs */

	for (i = 0; i < NUM_ISO_ETDS; i++) {

		ep_priv->etd[i] = alloc_etd(imx21);

		if (ep_priv->etd[i] < 0) {

			int j;

			dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");

			for (j = 0; j < i; j++)

				free_etd(imx21, ep_priv->etd[j]);

			goto alloc_etd_failed;

		}

		imx21->etd[ep_priv->etd[i]].ep = ep;

	}

	for (i = 0; i < NUM_ISO_ETDS; i++)

		ep_priv->etd[i] = -1;



	INIT_LIST_HEAD(&ep_priv->td_list);

	ep_priv->ep = ep;

	ep->hcpriv = ep_priv;

	return ep_priv;

}



static int alloc_isoc_etds(struct imx21 *imx21, struct ep_priv *ep_priv)

{

	int i, j;

	int etd_num;



	/* Allocate the ETDs if required */

	for (i = 0; i < NUM_ISO_ETDS; i++) {

		if (ep_priv->etd[i] < 0) {

			etd_num = alloc_etd(imx21);

			if (etd_num < 0)

				goto alloc_etd_failed;



			ep_priv->etd[i] = etd_num;

			imx21->etd[etd_num].ep = ep_priv->ep;

		}

	}

	return 0;



alloc_etd_failed:

	kfree(ep_priv);

	return NULL;

	dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");

	for (j = 0; j < i; j++) {

		free_etd(imx21, ep_priv->etd[j]);

		ep_priv->etd[j] = -1;

	}

	return -ENOMEM;

}



static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
@@ -639,6 +656,10 @@ static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd, 
		ep_priv = ep->hcpriv;

	}



	ret = alloc_isoc_etds(imx21, ep_priv);

	if (ret)

		goto alloc_etd_failed;



	ret = usb_hcd_link_urb_to_ep(hcd, urb);

	if (ret)

		goto link_failed;
@@ -718,6 +739,7 @@ static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd, 
	usb_hcd_unlink_urb_from_ep(hcd, urb);



link_failed:

alloc_etd_failed:

alloc_ep_failed:

	spin_unlock_irqrestore(&imx21->lock, flags);

	kfree(urb_priv->isoc_td);