usb: xhci: move initialization of the primary interrupter

Move the primary interrupter (0) initialization from xhci_mem_init() to
xhci_init(). This change requires us to save the allocated interrupter
somewhere before initialization. Therefore, store it in the 'interrupters'
array and rework xhci_add_interrupter() to retrieve the interrupter from
the array.

This is part of the ongoing effort to separate allocation and
initialization.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250515135621.335595-12-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 14 insertions, 13 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index bfb01c432b23..eb076f5ed1d0 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2321,14 +2321,13 @@ xhci_alloc_interrupter(struct xhci_hcd *xhci, unsigned int segs, gfp_t flags)
 	return ir;
 }
 
-static void
-xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
-		     unsigned int intr_num)
+void xhci_add_interrupter(struct xhci_hcd *xhci, unsigned int intr_num)
 {
+	struct xhci_interrupter *ir;
 	u64 erst_base;
 	u32 erst_size;
 
-	xhci->interrupters[intr_num] = ir;
+	ir = xhci->interrupters[intr_num];
 	ir->intr_num = intr_num;
 	ir->ir_set = &xhci->run_regs->ir_set[intr_num];
 
@@ -2372,14 +2371,16 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
 		/* Find available secondary interrupter, interrupter 0 is reserved for primary */
 		for (i = 1; i < xhci->max_interrupters; i++) {
 			if (!xhci->interrupters[i]) {
-				xhci_add_interrupter(xhci, ir, i);
+				xhci->interrupters[i] = ir;
+				xhci_add_interrupter(xhci, i);
 				err = 0;
 				break;
 			}
 		}
 	} else {
 		if (!xhci->interrupters[intr_num]) {
-			xhci_add_interrupter(xhci, ir, intr_num);
+			xhci->interrupters[intr_num] = ir;
+			xhci_add_interrupter(xhci, intr_num);
 			err = 0;
 		}
 	}
@@ -2406,7 +2407,6 @@ EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);
 
 int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 {
-	struct xhci_interrupter *ir;
 	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
 	dma_addr_t	dma;
 
@@ -2490,14 +2490,10 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	xhci->interrupters = kcalloc_node(xhci->max_interrupters, sizeof(*xhci->interrupters),
 					  flags, dev_to_node(dev));
 
-	ir = xhci_alloc_interrupter(xhci, 0, flags);
-	if (!ir)
+	xhci->interrupters[0] = xhci_alloc_interrupter(xhci, 0, flags);
+	if (!xhci->interrupters[0])
 		goto fail;
 
-	xhci_add_interrupter(xhci, ir, 0);
-
-	ir->isoc_bei_interval = AVOID_BEI_INTERVAL_MAX;
-
 	if (scratchpad_alloc(xhci, flags))
 		goto fail;
 	if (xhci_setup_port_arrays(xhci, flags))
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index fa80cc30c3fe..c6b517401c94 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -578,6 +578,10 @@ static int xhci_init(struct usb_hcd *hcd)
 	/* Set USB 3.0 device notifications for function remote wake */
 	xhci_set_dev_notifications(xhci);
 
+	/* Initialize the Primary interrupter */
+	xhci_add_interrupter(xhci, 0);
+	xhci->interrupters[0]->isoc_bei_interval = AVOID_BEI_INTERVAL_MAX;
+
 	/* Initializing Compliance Mode Recovery Data If Needed */
 	if (xhci_compliance_mode_recovery_timer_quirk_check()) {
 		xhci->quirks |= XHCI_COMP_MODE_QUIRK;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 31d945c4ac07..b0b16cd7df91 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1959,6 +1959,7 @@ void xhci_process_cancelled_tds(struct xhci_virt_ep *ep);
 void xhci_update_erst_dequeue(struct xhci_hcd *xhci,
 			      struct xhci_interrupter *ir,
 			      bool clear_ehb);
+void xhci_add_interrupter(struct xhci_hcd *xhci, unsigned int intr_num);
 
 /* xHCI roothub code */
 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,