diff options
| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2018-05-25 17:24:57 +0800 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2018-06-19 12:48:13 +0300 |
| commit | 980900d6318066b9f8314bfb87329a20fd0d1ca4 (patch) | |
| tree | 46c4f425c8c91c48001af3f6447ae8d87b54512c /drivers/usb/gadget/composite.c | |
| parent | 70c3c8cb83856758025c2a211dd022bc0478922a (diff) | |
| download | lwn-980900d6318066b9f8314bfb87329a20fd0d1ca4.tar.gz lwn-980900d6318066b9f8314bfb87329a20fd0d1ca4.zip | |
usb: gadget: composite: fix delayed_status race condition when set_interface
It happens when enable debug log, if set_alt() returns
USB_GADGET_DELAYED_STATUS and usb_composite_setup_continue()
is called before increasing count of @delayed_status,
so fix it by using spinlock of @cdev->lock.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Jay Hsu <shih-chieh.hsu@mediatek.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
| -rw-r--r-- | drivers/usb/gadget/composite.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index f242c2bcea81..d2fa071c21b1 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1719,6 +1719,8 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) */ if (w_value && !f->get_alt) break; + + spin_lock(&cdev->lock); value = f->set_alt(f, w_index, w_value); if (value == USB_GADGET_DELAYED_STATUS) { DBG(cdev, @@ -1728,6 +1730,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) DBG(cdev, "delayed_status count %d\n", cdev->delayed_status); } + spin_unlock(&cdev->lock); break; case USB_REQ_GET_INTERFACE: if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) |