@@ -2912,25 +2912,18 @@ static int handle_tx_event(struct xhci_hcd *xhci,
}
/*
- * This function handles all OS-owned events on the event ring. It may drop
+ * This function handles one OS-owned event on the event ring. It may drop
* xhci->lock between event processing (e.g. to pass up port status changes).
- * Returns >0 for "possibly more events to process" (caller should call again),
- * otherwise 0 if done. In future, <0 returns should indicate error code.
*/
-static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
+static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
+ union xhci_trb *event)
{
- union xhci_trb *event;
u32 trb_type;
- event = ir->event_ring->dequeue;
-
- if (!unhandled_event_trb(ir->event_ring))
- return 0;
-
trace_xhci_handle_event(ir->event_ring, &event->generic);
/*
- * Barrier between reading the TRB_CYCLE (valid) flag above and any
+ * Barrier between reading the TRB_CYCLE (valid) flag before, and any
* speculative reads of the event's flags/data below.
*/
rmb();
@@ -2960,15 +2953,11 @@ static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
* to make sure a watchdog timer didn't mark the host as non-responsive.
*/
if (xhci->xhc_state & XHCI_STATE_DYING) {
- xhci_dbg(xhci, "xHCI host dying, returning from "
- "event handler.\n");
- return 0;
+ xhci_dbg(xhci, "xHCI host dying, returning from event handler.\n");
+ return -ENODEV;
}
- /* Are there more items on the event ring? Caller will call us again to
- * check.
- */
- return 1;
+ return 0;
}
/*
@@ -3018,9 +3007,14 @@ static void xhci_clear_interrupt_pending(struct xhci_hcd *xhci,
}
}
+/*
+ * Handle all OS-owned events on an interrupter event ring. It may drop
+ * and reaquire xhci->lock between event processing.
+ */
static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
{
int event_loop = 0;
+ int err;
u64 temp;
xhci_clear_interrupt_pending(xhci, ir);
@@ -3041,7 +3035,10 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir
return -ENODEV;
}
- while (xhci_handle_event(xhci, ir) > 0) {
+ /* Process all OS owned event TRBs on this event ring */
+ while (unhandled_event_trb(ir->event_ring)) {
+ err = xhci_handle_event_trb(xhci, ir, ir->event_ring->dequeue);
+
/*
* If half a segment of events have been handled in one go then
* update ERDP, and force isoc trbs to interrupt more often
@@ -3057,6 +3054,9 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir
/* Update SW event ring dequeue pointer */
inc_deq(xhci, ir->event_ring);
+
+ if (err)
+ break;
}
xhci_update_erst_dequeue(xhci, ir, true);