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| author | Thomas Pugliese <thomas.pugliese@gmail.com> | 2013-10-01 21:04:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-04 00:46:26 +0200 |
| commit | 7e176dcb035eef8917e5fc2e653460b5410dbc34 (patch) | |
| tree | c3883880d23e756d1892b6f76606e8005c3d13a4 /drivers/usb/host/hwa-hc.c | |
| parent | usb: wusbcore: avoid stack overflow in URB enqueue error path (diff) | |
| download | linux-7e176dcb035eef8917e5fc2e653460b5410dbc34.tar.xz linux-7e176dcb035eef8917e5fc2e653460b5410dbc34.zip | |
usb: wusbcore: implement hwahc_op_get_frame_number
This patch adds an implementation for hwahc_op_get_frame_number. The
request is fulfulled by forwarding it to the lower hcd. This was done
because the GET_TIME request on the HWA requires sending an URB to the
HWA and waiting for the results which cannot be done in atomic context.
Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/hwa-hc.c')
| -rw-r--r-- | drivers/usb/host/hwa-hc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/host/hwa-hc.c b/drivers/usb/host/hwa-hc.c index 5b86ffb88f1c..e58b92491eb1 100644 --- a/drivers/usb/host/hwa-hc.c +++ b/drivers/usb/host/hwa-hc.c @@ -199,10 +199,14 @@ static int hwahc_op_get_frame_number(struct usb_hcd *usb_hcd) { struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc); + struct wahc *wa = &hwahc->wa; - dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__, - usb_hcd, hwahc); - return -ENOSYS; + /* + * We cannot query the HWA for the WUSB time since that requires sending + * a synchronous URB and this function can be called in_interrupt. + * Instead, query the USB frame number for our parent and use that. + */ + return usb_get_current_frame_number(wa->usb_dev); } static int hwahc_op_urb_enqueue(struct usb_hcd *usb_hcd, struct urb *urb, |