diff options
| author | Matt Evans <matt@ozlabs.org> | 2011-03-29 13:41:02 +1100 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2011-05-02 16:42:50 -0700 |
| commit | 9dee9a213cb90fdc13118ab221f65c9fa6944f7a (patch) | |
| tree | 4f47812a37cef571cf6870f717b7ac68788040b1 | |
| parent | 7ed603ecf8b68ab81f4c83097d3063d43ec73bb8 (diff) | |
| download | blackbird-op-linux-9dee9a213cb90fdc13118ab221f65c9fa6944f7a.tar.gz blackbird-op-linux-9dee9a213cb90fdc13118ab221f65c9fa6944f7a.zip | |
xhci: Remove recursive call to xhci_handle_event
Make the caller loop while there are events to handle, instead.
Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
| -rw-r--r-- | 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 e0f05f5abe10..73f8db0ecc4b 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. */ |
