Hello.
On 26-07-2011 4:34, Andiry Xu wrote:
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@xxxxxxx>
---
drivers/usb/host/xhci-mem.c | 14 +++-----------
drivers/usb/host/xhci.c | 15 +++++++++------
2 files changed, 12 insertions(+), 17 deletions(-)
[...]
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index d0a6540..95c6d91 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1029,6 +1029,7 @@ static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct xhci_td *buffer;
unsigned long flags;
int ret = 0;
unsigned int slot_id, ep_index;
@@ -1059,13 +1060,15 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
if (!urb_priv)
return -ENOMEM;
+ buffer = kzalloc(size * sizeof(struct xhci_td), mem_flags);
kcalloc() fits somewhat better here.
WBR, Sergei
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