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USB: EHCI: store reason for unlinking a QH 

This patch replaces the "exception" bitflag in the ehci_qh structure
with a more explicit "unlink_reason" bitmask.  This is for use in the
following patch, where we will need to have a good idea of the
reason for unlinking a QH, not just "something exceptional happened".

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Michael Reutman <mreutman@epiqsolutions.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2016-01-25 15:42:04 -05:00 committed by Greg Kroah-Hartman
parent 4f97f8f5f0
commit fcc5184ec1
5 changed files with 26 additions and 11 deletions
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11
drivers/usb/host/ehci-hcd.c
View File

@ -911,7 +911,7 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
*/
} else {
qh = (struct ehci_qh *) urb->hcpriv;
qh->exception = 1;
qh->unlink_reason |= QH_UNLINK_REQUESTED;
switch (qh->qh_state) {
case QH_STATE_LINKED:
if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
@ -972,10 +972,13 @@ rescan:
goto done;
}
qh->exception = 1;
qh->unlink_reason |= QH_UNLINK_REQUESTED;
switch (qh->qh_state) {
case QH_STATE_LINKED:
WARN_ON(!list_empty(&qh->qtd_list));
if (list_empty(&qh->qtd_list))
qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
else
WARN_ON(1);
if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
start_unlink_async(ehci, qh);
else
@ -1042,7 +1045,7 @@ ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
* re-linking will call qh_refresh().
*/
usb_settoggle(qh->ps.udev, epnum, is_out, 0);
qh->exception = 1;
qh->unlink_reason |= QH_UNLINK_REQUESTED;
if (eptype == USB_ENDPOINT_XFER_BULK)
start_unlink_async(ehci, qh);
else

13
drivers/usb/host/ehci-q.c
View File

@ -394,6 +394,7 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
goto retry_xacterr;
}
stopped = 1;
qh->unlink_reason |= QH_UNLINK_HALTED;
/* magic dummy for some short reads; qh won't advance.
* that silicon quirk can kick in with this dummy too.
@ -408,6 +409,7 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
&& !(qtd->hw_alt_next
& EHCI_LIST_END(ehci))) {
stopped = 1;
qh->unlink_reason |= QH_UNLINK_SHORT_READ;
}
/* stop scanning when we reach qtds the hc is using */
@ -420,8 +422,10 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
stopped = 1;
/* cancel everything if we halt, suspend, etc */
if (ehci->rh_state < EHCI_RH_RUNNING)
if (ehci->rh_state < EHCI_RH_RUNNING) {
last_status = -ESHUTDOWN;
qh->unlink_reason |= QH_UNLINK_SHUTDOWN;
}
/* this qtd is active; skip it unless a previous qtd
* for its urb faulted, or its urb was canceled.
@ -538,10 +542,10 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
* except maybe high bandwidth ...
*/
if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci))
qh->exception = 1;
qh->unlink_reason |= QH_UNLINK_DUMMY_OVERLAY;
/* Let the caller know if the QH needs to be unlinked. */
return qh->exception;
return qh->unlink_reason;
}
/*-------------------------------------------------------------------------*/
@ -1003,7 +1007,7 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
qh->qh_state = QH_STATE_LINKED;
qh->xacterrs = 0;
qh->exception = 0;
qh->unlink_reason = 0;
/* qtd completions reported later by interrupt */
enable_async(ehci);
@ -1395,6 +1399,7 @@ static void unlink_empty_async(struct ehci_hcd *ehci)
/* If nothing else is being unlinked, unlink the last empty QH */
if (list_empty(&ehci->async_unlink) && qh_to_unlink) {
qh_to_unlink->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
start_unlink_async(ehci, qh_to_unlink);
--count;
}

2
drivers/usb/host/ehci-sched.c
View File

@ -595,7 +595,7 @@ static void qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
}
qh->qh_state = QH_STATE_LINKED;
qh->xacterrs = 0;
qh->exception = 0;
qh->unlink_reason = 0;
/* update per-qh bandwidth for debugfs */
ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->ps.bw_period

1
drivers/usb/host/ehci-timer.c
View File

@ -237,6 +237,7 @@ static void ehci_handle_start_intr_unlinks(struct ehci_hcd *ehci)
ehci->intr_unlink_wait_cycle))
break;
list_del_init(&qh->unlink_node);
qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
start_unlink_intr(ehci, qh);
}

10
drivers/usb/host/ehci.h
View File

@ -432,13 +432,19 @@ struct ehci_qh {
u8 xacterrs; /* XactErr retry counter */
#define QH_XACTERR_MAX 32 /* XactErr retry limit */
u8 unlink_reason;
#define QH_UNLINK_HALTED 0x01 /* Halt flag is set */
#define QH_UNLINK_SHORT_READ 0x02 /* Recover from a short read */
#define QH_UNLINK_DUMMY_OVERLAY 0x04 /* QH overlayed the dummy TD */
#define QH_UNLINK_SHUTDOWN 0x08 /* The HC isn't running */
#define QH_UNLINK_QUEUE_EMPTY 0x10 /* Reached end of the queue */
#define QH_UNLINK_REQUESTED 0x20 /* Disable, reset, or dequeue */
u8 gap_uf; /* uframes split/csplit gap */
unsigned is_out:1; /* bulk or intr OUT */
unsigned clearing_tt:1; /* Clear-TT-Buf in progress */
unsigned dequeue_during_giveback:1;
unsigned exception:1; /* got a fault, or an unlink
was requested */
unsigned should_be_inactive:1;
};