Re: [PATCH v24 06/34] usb: host: xhci-mem: Allow for interrupter clients to choose specific index

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On 8/1/2024 3:17 AM, Wesley Cheng wrote:
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@xxxxxxxxxxx>
---
  drivers/usb/host/xhci-mem.c       | 29 ++++++++++++++++-------------
  drivers/usb/host/xhci-sideband.c  |  4 ++--
  drivers/usb/host/xhci.h           |  2 +-
  include/linux/usb/xhci-sideband.h |  2 +-
  4 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 60dfc59260d8..997e8f27acb8 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2340,7 +2340,7 @@ xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
struct xhci_interrupter *
  xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
-					u32 imod_interval)
+					u32 imod_interval, int intr_num)
  {
  	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  	struct xhci_interrupter *ir;
@@ -2355,29 +2355,32 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
  		return NULL;
spin_lock_irq(&xhci->lock);
-
  	/* Find available secondary interrupter, interrupter 0 is reserved 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);
+				if (err) {
+					spin_unlock_irq(&xhci->lock);
+					goto free_ir;
+				}
+				break;
+			}
  		}
  	}

When intr_num is set, you don't really need to iterate to search for free slot, as you already know which one you want to use?

Wouldn't something like:
/* Find available secondary interrupter, interrupter 0 is reserved for primary */
        if (!intr_num) {
                for (i = 1; i < xhci->max_interrupters; i++) {
                        if (xhci->interrupters[i] == NULL) {
                                err = xhci_add_interrupter(xhci, ir, i);
                                break;
                        }
                }
        } else {
                if (xhci->interrupters[intr_num] == NULL)
                        err = xhci_add_interrupter(xhci, ir, i);
        }
make more sense, also make intr_num unsigned int, as it should never be negative as it is index into a table.

-
  	spin_unlock_irq(&xhci->lock);
- if (err) {
-		xhci_warn(xhci, "Failed to add secondary interrupter, max interrupters %d\n",
-			  xhci->max_interrupters);
-		xhci_free_interrupter(xhci, ir);
-		return NULL;
-	}
-
  	xhci_set_interrupter_moderation(ir, imod_interval);
+
  	xhci_dbg(xhci, "Add secondary interrupter %d, max interrupters %d\n",
  		 i, xhci->max_interrupters);
return ir;
+
+free_ir:
+	xhci_free_interrupter(xhci, ir);
+
+	return NULL;
  }
  EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);

(...)





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