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Fail operations if Close was called before.

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This commit is contained in:
Sebastian Zagrodzki
2017-04-29 00:18:26 +02:00
parent b6268be76b
commit 0cfaee3514
4 changed files with 42 additions and 2 deletions
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10
usb/interface.go
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@@ -71,10 +71,14 @@ func (i *Interface) String() string {
// Close releases the interface.
func (i *Interface) Close() {
if i.config == nil {
return
}
libusb.release(i.config.dev.handle, uint8(i.Setting.Number))
i.config.mu.Lock()
defer i.config.mu.Unlock()
delete(i.config.claimed, i.Setting.Number)
i.config = nil
}
func (i *Interface) openEndpoint(epNum int) (*endpoint, error) {
@@ -100,6 +104,9 @@ func (i *Interface) openEndpoint(epNum int) (*endpoint, error) {
// InEndpoint prepares an IN endpoint for transfer.
func (i *Interface) InEndpoint(epNum int) (*InEndpoint, error) {
if i.config == nil {
return nil, fmt.Errorf("InEndpoint(%d) called on %s after Close", epNum, i)
}
ep, err := i.openEndpoint(epNum)
if err != nil {
return nil, err
@@ -114,6 +121,9 @@ func (i *Interface) InEndpoint(epNum int) (*InEndpoint, error) {
// OutEndpoint prepares an OUT endpoint for transfer.
func (i *Interface) OutEndpoint(epNum int) (*OutEndpoint, error) {
if i.config == nil {
return nil, fmt.Errorf("OutEndpoint(%d) called on %s after Close", epNum, i)
}
ep, err := i.openEndpoint(epNum)
if err != nil {
return nil, err