From: Mathias Nyman Date: Sat, 17 Feb 2024 00:09:34 +0000 (-0800) Subject: xhci: Don't check if the event ring is valid before every event TRB X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=84008be8adb091d419659dda8e655b1956d3c230;p=linux.git xhci: Don't check if the event ring is valid before every event TRB Check if the event ring exists and is valid once when the event handler is called, not before every individual event TRB. At this point the interrupter is valid, so no need to check that. Signed-off-by: Mathias Nyman Signed-off-by: Wesley Cheng Link: https://lore.kernel.org/r/20240217001017.29969-9-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 275164dc449d7..d31599d46b928 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2972,12 +2972,6 @@ static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir) union xhci_trb *event; u32 trb_type; - /* Event ring hasn't been allocated yet. */ - if (!ir || !ir->event_ring || !ir->event_ring->dequeue) { - xhci_err(xhci, "ERROR interrupter not ready\n"); - return -ENOMEM; - } - event = ir->event_ring->dequeue; if (!unhandled_event_trb(ir->event_ring)) @@ -3081,6 +3075,12 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir xhci_clear_interrupt_pending(xhci, ir); + /* Event ring hasn't been allocated yet. */ + if (!ir->event_ring || !ir->event_ring->dequeue) { + xhci_err(xhci, "ERROR interrupter event ring not ready\n"); + return -ENOMEM; + } + if (xhci->xhc_state & XHCI_STATE_DYING || xhci->xhc_state & XHCI_STATE_HALTED) { xhci_dbg(xhci, "xHCI dying, ignoring interrupt. Shouldn't IRQs be disabled?\n");