fix: avoid timed value for network calls (#11531)

additionally simply timedValue to have RWMutex
to avoid concurrent calls to DiskInfo() getting
serialized, this has an effect on all calls that
use GetDiskInfo() on the same disks.

Such as getOnlineDisks, getOnlineDisksWithoutHealing

cmd/storage-rest-client.go

@@ -29,7 +29,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 
 	"github.com/minio/minio/cmd/http"
 	xhttp "github.com/minio/minio/cmd/http"
@@ -120,8 +119,6 @@ type storageRESTClient struct {
 	endpoint   Endpoint
 	restClient *rest.Client
 	diskID     string
-
-	diskInfoCache timedValue
 }
 
 // Wrapper to restClient.Call to handle network errors, in case of network error the connection is makred disconnected
@@ -218,27 +215,18 @@ func (client *storageRESTClient) SetDiskID(id string) {
 
 // DiskInfo - fetch disk information for a remote disk.
 func (client *storageRESTClient) DiskInfo(ctx context.Context) (info DiskInfo, err error) {
-	client.diskInfoCache.Once.Do(func() {
-		client.diskInfoCache.TTL = time.Second
-		client.diskInfoCache.Update = func() (interface{}, error) {
-			var info DiskInfo
-			respBody, err := client.call(ctx, storageRESTMethodDiskInfo, nil, nil, -1)
-			if err != nil {
-				return info, err
-			}
-			defer http.DrainBody(respBody)
-			if err = msgp.Decode(respBody, &info); err != nil {
-				return info, err
-			}
-			if info.Error != "" {
-				return info, toStorageErr(errors.New(info.Error))
-			}
-			return info, nil
-		}
-	})
-	v, err := client.diskInfoCache.Get()
-	info = v.(DiskInfo)
-	return info, err
+	respBody, err := client.call(ctx, storageRESTMethodDiskInfo, nil, nil, -1)
+	if err != nil {
+		return info, err
+	}
+	defer http.DrainBody(respBody)
+	if err = msgp.Decode(respBody, &info); err != nil {
+		return info, err
+	}
+	if info.Error != "" {
+		return info, toStorageErr(errors.New(info.Error))
+	}
+	return info, nil
 }
 
 // MakeVolBulk - create multiple volumes in a bulk operation.