diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/gadget.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index f1b0dca60f1..16892ab59c8 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -533,6 +533,7 @@ struct usb_gadget { unsigned b_hnp_enable:1; unsigned a_hnp_support:1; unsigned a_alt_hnp_support:1; + atomic_t connect_count; const char *name; struct device dev; unsigned out_epnum; @@ -724,7 +725,11 @@ static inline int usb_gadget_connect(struct usb_gadget *gadget) { if (!gadget->ops->pullup) return -EOPNOTSUPP; - return gadget->ops->pullup(gadget, 1); + + if (atomic_inc_return(&gadget->connect_count) == 1) + return gadget->ops->pullup(gadget, 1); + + return 0; } /** @@ -746,7 +751,11 @@ static inline int usb_gadget_disconnect(struct usb_gadget *gadget) { if (!gadget->ops->pullup) return -EOPNOTSUPP; - return gadget->ops->pullup(gadget, 0); + + if (atomic_dec_and_test(&gadget->connect_count)) + return gadget->ops->pullup(gadget, 0); + + return 0; } |