diff mbox series

[v13,10/53] xhci: Don't check if the event ring is valid before every event TRB

Message ID 20240203023645.31105-11-quic_wcheng@quicinc.com
State New
Headers show
Series [v13,01/53] xhci: fix possible null pointer dereference at secondary interrupter removal | expand

Commit Message

Wesley Cheng Feb. 3, 2024, 2:36 a.m. UTC 
From: Mathias Nyman <mathias.nyman@linux.intel.com>

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 <mathias.nyman@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 drivers/usb/host/xhci-ring.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 48388bc16b24..293239d8fab0 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2922,12 +2922,6 @@  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))
@@ -3031,6 +3025,12 @@  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");