usb: prevent registering duplicate config callbacks
Originally discussed at https://github.com/libopencm3/libopencm3/pull/722
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@ -139,7 +139,8 @@ extern int usbd_register_control_callback(usbd_device *usbd_dev, uint8_t type,
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/* <usb_standard.c> */
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/** Registers a "Set Config" callback
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* @return 0 if successful
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* @return 0 if successful or already existed.
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* @return -1 if no more space was available for callbacks.
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*/
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extern int usbd_register_set_config_callback(usbd_device *usbd_dev,
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usbd_set_config_callback callback);
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@ -46,6 +46,9 @@ int usbd_register_set_config_callback(usbd_device *usbd_dev,
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for (i = 0; i < MAX_USER_SET_CONFIG_CALLBACK; i++) {
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if (usbd_dev->user_callback_set_config[i]) {
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if (usbd_dev->user_callback_set_config[i] == callback) {
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return 0;
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}
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continue;
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}
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