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From:   Wesley Cheng <quic_wcheng@quicinc.com>
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Subject: [PATCH v4 05/32] usb: host: xhci-mem: Allow for interrupter clients to choose specific index
Date:   Mon, 24 Jul 2023 19:33:49 -0700
Message-ID: <20230725023416.11205-6-quic_wcheng@quicinc.com>
In-Reply-To: <20230725023416.11205-1-quic_wcheng@quicinc.com>
References: <20230725023416.11205-1-quic_wcheng@quicinc.com>
MIME-Version: 1.0
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Some clients may operate only on a specific XHCI interrupter instance.
Allow for the associated class driver to request for the interrupter that
it requires.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 drivers/usb/host/xhci-mem.c   | 12 ++++++------
 include/linux/usb/xhci-intr.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 6b01d56c176f..310137df06eb 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2396,7 +2396,7 @@ xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
 }
 
 struct xhci_interrupter *
-xhci_create_secondary_interrupter(struct usb_hcd *hcd)
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int intr_num)
 {
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 	struct xhci_interrupter *ir;
@@ -2411,15 +2411,15 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd)
 		return NULL;
 
 	spin_lock_irq(&xhci->lock);
-
 	/* Find available secondary interrupter, interrupter 0 is reserverd for primary */
 	for (i = 1; i < xhci->max_interrupters; i++) {
-		if (xhci->interrupters[i] == NULL) {
-			err = xhci_add_interrupter(xhci, ir, i);
-			break;
+		if ((intr_num > 0 && i == intr_num) || intr_num <= 0) {
+			if (xhci->interrupters[i] == NULL) {
+				err = xhci_add_interrupter(xhci, ir, i);
+				break;
+			}
 		}
 	}
-
 	spin_unlock_irq(&xhci->lock);
 
 	if (!err) {
diff --git a/include/linux/usb/xhci-intr.h b/include/linux/usb/xhci-intr.h
index e0091ee2c73a..738b0f0481a6 100644
--- a/include/linux/usb/xhci-intr.h
+++ b/include/linux/usb/xhci-intr.h
@@ -81,6 +81,6 @@ struct xhci_interrupter {
 };
 
 struct xhci_interrupter *
-xhci_create_secondary_interrupter(struct usb_hcd *hcd);
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int intr_num);
 void xhci_remove_secondary_interrupter(struct usb_hcd *hcd, struct xhci_interrupter *ir);
 #endif