Use RWMutex instead of Mutex

pkg/minikube/registry/registry.go

@@ -109,7 +109,7 @@ func (d DriverDef) String() string {
 
 type driverRegistry struct {
 	drivers map[string]DriverDef
-	lock    sync.Mutex
+	lock    sync.RWMutex
 }
 
 func newRegistry() *driverRegistry {
@@ -133,8 +133,8 @@ func (r *driverRegistry) Register(def DriverDef) error {
 
 // List returns a list of registered drivers
 func (r *driverRegistry) List() []DriverDef {
-	r.lock.Lock()
-	defer r.lock.Unlock()
+	r.lock.RLock()
+	defer r.lock.RUnlock()
 
 	result := make([]DriverDef, 0, len(r.drivers))
 
@@ -147,7 +147,7 @@ func (r *driverRegistry) List() []DriverDef {
 
 // Driver returns a driver given a name
 func (r *driverRegistry) Driver(name string) DriverDef {
-	r.lock.Lock()
-	defer r.lock.Unlock()
+	r.lock.RLock()
+	defer r.lock.RUnlock()
 	return r.drivers[name]
 }

third_party/go9p/srv_file.go

@@ -81,7 +81,7 @@ const (
 
 // The srvFile type represents a file (or directory) served by the file server.
 type srvFile struct {
-	sync.Mutex
+	sync.RWMutex
 	Dir
 	flags FFlags
 
@@ -239,13 +239,13 @@ func (f *srvFile) Rename(name string) error {
 func (p *srvFile) Find(name string) *srvFile {
 	var f *srvFile
 
-	p.Lock()
+	p.RLock()
 	for f = p.cfirst; f != nil; f = f.next {
 		if name == f.Name {
 			break
 		}
 	}
-	p.Unlock()
+	p.RUnlock()
 	return f
 }
 
@@ -496,13 +496,13 @@ func (*Fsrv) Clunk(req *SrvReq) {
 func (*Fsrv) Remove(req *SrvReq) {
 	fid := req.Fid.Aux.(*FFid)
 	f := fid.F
-	f.Lock()
+	f.RLock()
 	if f.cfirst != nil {
-		f.Unlock()
+		f.RUnlock()
 		req.RespondError(Enotempty)
 		return
 	}
-	f.Unlock()
+	f.RUnlock()
 
 	if rop, ok := (f.ops).(FRemoveOp); ok {
 		err := rop.Remove(fid)