xHCI: refine td allocation

In xhci_urb_enqueue(), allocate a block of memory for all the TDs instead
of allocating memory for each of them separately. This reduces the number
of kzalloc calling when an isochronous usb is submitted.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 11 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 1c5c9ba141db..c4b8959e01e7 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1666,18 +1666,10 @@ struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
 
 void xhci_urb_free_priv(struct xhci_hcd *xhci, struct urb_priv *urb_priv)
 {
-        int last;
-
-        if (!urb_priv)
-                return;
-
-        last = urb_priv->length - 1;
-        if (last >= 0) {
-                int     i;
-                for (i = 0; i <= last; i++)
-                        kfree(urb_priv->td[i]);
+        if (urb_priv) {
+                kfree(urb_priv->td[0]);
+                kfree(urb_priv);
         }
-        kfree(urb_priv);
 }
 
 void xhci_free_command(struct xhci_hcd *xhci,