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USB: EHCI: don't refcount iso_stream structures

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This patch (as1580) makes ehci_iso_stream structures behave more like
QHs, in that they will remain allocated until their isochronous
endpoint is disabled.  This will come in useful in the future, when
periodic bandwidth gets allocated as an altsetting is installed rather
than on-the-fly.

For now, the change to the ehci_iso_stream lifetimes means that each
structure is always deallocated at exactly one spot in
ehci_endpoint_disable() and never used again.  As a result, it is no
longer necessary to use reference counting on these things, and the
patch removes it.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2012-07-11 11:22:39 -04:00 committed by Greg Kroah-Hartman
parent 55934eb3b9
commit 8c5bf7be56
3 changed files with 16 additions and 52 deletions
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12
drivers/usb/host/ehci-hcd.c
View File

@ -1085,8 +1085,14 @@ rescan:
* accelerate iso completions ... so spin a while.
*/
if (qh->hw == NULL) {
ehci_vdbg (ehci, "iso delay\n");
goto idle_timeout;
struct ehci_iso_stream *stream = ep->hcpriv;
if (!list_empty(&stream->td_list))
goto idle_timeout;
/* BUG_ON(!list_empty(&stream->free_list)); */
kfree(stream);
goto done;
}
if (ehci->rh_state < EHCI_RH_RUNNING)
@ -1127,8 +1133,8 @@ idle_timeout:
list_empty (&qh->qtd_list) ? "" : "(has tds)");
break;
}
done:
ep->hcpriv = NULL;
done:
spin_unlock_irqrestore (&ehci->lock, flags);
}

53
drivers/usb/host/ehci-sched.c
View File

@ -934,7 +934,6 @@ iso_stream_alloc (gfp_t mem_flags)
INIT_LIST_HEAD(&stream->td_list);
INIT_LIST_HEAD(&stream->free_list);
stream->next_uframe = -1;
stream->refcount = 1;
}
return stream;
}
@ -1034,32 +1033,6 @@ iso_stream_init (
stream->maxp = maxp;
}
static void
iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
{
stream->refcount--;
/* free whenever just a dev->ep reference remains.
* not like a QH -- no persistent state (toggle, halt)
*/
if (stream->refcount == 1) {
// BUG_ON (!list_empty(&stream->td_list));
if (stream->ep)
stream->ep->hcpriv = NULL;
kfree(stream);
}
}
static inline struct ehci_iso_stream *
iso_stream_get (struct ehci_iso_stream *stream)
{
if (likely (stream != NULL))
stream->refcount++;
return stream;
}
static struct ehci_iso_stream *
iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
{
@ -1080,7 +1053,6 @@ iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
if (unlikely (stream == NULL)) {
stream = iso_stream_alloc(GFP_ATOMIC);
if (likely (stream != NULL)) {
/* dev->ep owns the initial refcount */
ep->hcpriv = stream;
stream->ep = ep;
iso_stream_init(ehci, stream, urb->dev, urb->pipe,
@ -1095,9 +1067,6 @@ iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
stream = NULL;
}
/* caller guarantees an eventual matching iso_stream_put */
stream = iso_stream_get (stream);
spin_unlock_irqrestore (&ehci->lock, flags);
return stream;
}
@ -1611,7 +1580,7 @@ static void itd_link_urb(
itd = list_entry (iso_sched->td_list.next,
struct ehci_itd, itd_list);
list_move_tail (&itd->itd_list, &stream->td_list);
itd->stream = iso_stream_get (stream);
itd->stream = stream;
itd->urb = urb;
itd_init (ehci, stream, itd);
}
@ -1735,7 +1704,6 @@ itd_complete (
dev->devpath, stream->bEndpointAddress & 0x0f,
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
}
iso_stream_put (ehci, stream);
done:
itd->urb = NULL;
@ -1750,7 +1718,6 @@ done:
start_free_itds(ehci);
}
iso_stream_put(ehci, stream);
return retval;
}
@ -1807,12 +1774,9 @@ static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
else
usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
done_not_linked:
done_not_linked:
spin_unlock_irqrestore (&ehci->lock, flags);
done:
if (unlikely (status < 0))
iso_stream_put (ehci, stream);
done:
return status;
}
@ -2028,7 +1992,7 @@ static void sitd_link_urb(
sitd = list_entry (sched->td_list.next,
struct ehci_sitd, sitd_list);
list_move_tail (&sitd->sitd_list, &stream->td_list);
sitd->stream = iso_stream_get (stream);
sitd->stream = stream;
sitd->urb = urb;
sitd_patch(ehci, stream, sitd, sched, packet);
@ -2126,7 +2090,6 @@ sitd_complete (
dev->devpath, stream->bEndpointAddress & 0x0f,
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
}
iso_stream_put (ehci, stream);
done:
sitd->urb = NULL;
@ -2141,7 +2104,6 @@ done:
start_free_itds(ehci);
}
iso_stream_put(ehci, stream);
return retval;
}
@ -2195,12 +2157,9 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
else
usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
done_not_linked:
done_not_linked:
spin_unlock_irqrestore (&ehci->lock, flags);
done:
if (status < 0)
iso_stream_put (ehci, stream);
done:
return status;
}

3
drivers/usb/host/ehci.h
View File

@ -386,7 +386,7 @@ struct ehci_qh_hw {
} __attribute__ ((aligned(32)));
struct ehci_qh {
struct ehci_qh_hw *hw;
struct ehci_qh_hw *hw; /* Must come first */
/* the rest is HCD-private */
dma_addr_t qh_dma; /* address of qh */
union ehci_shadow qh_next; /* ptr to qh; or periodic */
@ -453,7 +453,6 @@ struct ehci_iso_stream {
/* first field matches ehci_hq, but is NULL */
struct ehci_qh_hw *hw;
u32 refcount;
u8 bEndpointAddress;
u8 highspeed;
struct list_head td_list; /* queued itds/sitds */