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authorBjørn Mork <bjorn@mork.no>2012-01-16 15:11:58 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-24 14:32:21 -0800
commit19b85b3b87fd1388df1f4a35969823521d35d243 (patch)
treef206d2512557be7b3a86453a1bead66f417cdff2 /drivers/usb/class
parent0b238583ac8db66762bba021de1b7c60b6bc29ad (diff)
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USB: cdc-wdm: no need to fill the in request URB every time it's submitted
Filling the same URB with the exact same data is pointless. It can be filled once and resubmitted. And not doing buffer allocation and URB filling at the same place only serves to hide size mismatch bugs Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c39
1 files changed, 19 insertions, 20 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 1c50baff772..9734863a3a4 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -159,11 +159,9 @@ static void wdm_int_callback(struct urb *urb)
int rv = 0;
int status = urb->status;
struct wdm_device *desc;
- struct usb_ctrlrequest *req;
struct usb_cdc_notification *dr;
desc = urb->context;
- req = desc->irq;
dr = (struct usb_cdc_notification *)desc->sbuf;
if (status) {
@@ -210,24 +208,6 @@ static void wdm_int_callback(struct urb *urb)
goto exit;
}
- req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
- req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
- req->wValue = 0;
- req->wIndex = desc->inum;
- req->wLength = cpu_to_le16(desc->wMaxCommand);
-
- usb_fill_control_urb(
- desc->response,
- interface_to_usbdev(desc->intf),
- /* using common endpoint 0 */
- usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
- (unsigned char *)req,
- desc->inbuf,
- desc->wMaxCommand,
- wdm_in_callback,
- desc
- );
- desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
spin_lock(&desc->iuspin);
clear_bit(WDM_READ, &desc->flags);
set_bit(WDM_RESPONDING, &desc->flags);
@@ -734,6 +714,25 @@ next_desc:
);
desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
+ desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
+ desc->irq->wValue = 0;
+ desc->irq->wIndex = desc->inum;
+ desc->irq->wLength = cpu_to_le16(desc->wMaxCommand);
+
+ usb_fill_control_urb(
+ desc->response,
+ interface_to_usbdev(desc->intf),
+ /* using common endpoint 0 */
+ usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
+ (unsigned char *)desc->irq,
+ desc->inbuf,
+ desc->wMaxCommand,
+ wdm_in_callback,
+ desc
+ );
+ desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
usb_set_intfdata(intf, desc);
rv = usb_register_dev(intf, &wdm_class);
if (rv < 0)