diff options
| author |   Bjørn Mork <bjorn@mork.no> | 2012-01-16 15:11:58 +0100 |
|---|---|---|
| committer | Bjørn Mork <bjorn@mork.no> | 2012-06-04 21:57:51 +0200 |
| commit | 99d8d5d39895eaa0e44e7d793e1e0c3d4177838d (patch) | |
| tree | 57c89f926297dd1de7e2199b3da3089dc32b7ad7 | |
| parent | 0f9d847d631f822b02d74bf4a30bd420b819fff0 (diff) | |
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>
(cherry picked from commit 19b85b3b87fd1388df1f4a35969823521d35d243)
Signed-off-by: Bjørn Mork <bjorn@mork.no>
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 39 |
1 files changed, 19 insertions, 20 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 5fd3f0d48a1..18b91424c70 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -163,11 +163,9 @@ 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) { @@ -214,24 +212,6 @@ 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); @@ -751,6 +731,25 @@ 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) |