From: Matt Evans <matt@xxxxxxxxxx> Make the caller loop while there are events to handle, instead. Signed-off-by: Matt Evans <matt@xxxxxxxxxx> Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-ring.c | 18 +++++++++++------- 1 files changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index e0f05f5..73f8db0 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2171,8 +2171,10 @@ cleanup: /* * This function handles all OS-owned events 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 void xhci_handle_event(struct xhci_hcd *xhci) +static int xhci_handle_event(struct xhci_hcd *xhci) { union xhci_trb *event; int update_ptrs = 1; @@ -2181,7 +2183,7 @@ static void xhci_handle_event(struct xhci_hcd *xhci) xhci_dbg(xhci, "In %s\n", __func__); if (!xhci->event_ring || !xhci->event_ring->dequeue) { xhci->error_bitmask |= 1 << 1; - return; + return 0; } event = xhci->event_ring->dequeue; @@ -2189,7 +2191,7 @@ static void xhci_handle_event(struct xhci_hcd *xhci) if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) != xhci->event_ring->cycle_state) { xhci->error_bitmask |= 1 << 2; - return; + return 0; } xhci_dbg(xhci, "%s - OS owns TRB\n", __func__); @@ -2233,15 +2235,17 @@ static void xhci_handle_event(struct xhci_hcd *xhci) if (xhci->xhc_state & XHCI_STATE_DYING) { xhci_dbg(xhci, "xHCI host dying, returning from " "event handler.\n"); - return; + return 0; } if (update_ptrs) /* Update SW event ring dequeue pointer */ inc_deq(xhci, xhci->event_ring, true); - /* Are there more items on the event ring? */ - xhci_handle_event(xhci); + /* Are there more items on the event ring? Caller will call us again to + * check. + */ + return 1; } /* @@ -2323,7 +2327,7 @@ hw_died: /* FIXME this should be a delayed service routine * that clears the EHB. */ - xhci_handle_event(xhci); + while (xhci_handle_event(xhci) > 0) {} temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); /* If necessary, update the HW's version of the event ring deq ptr. */ -- 1.7.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html