csi: fix incorrect comment on csi_hook context lifetime

client/allocrunner/csi_hook.go

@@ -34,12 +34,10 @@ func (c *csiHook) Prerun() error {
 		return nil
 	}
 
-	// TODO(tgross): the contexts for the CSI RPC calls made during
-	// mounting can have very long timeouts. Until these are better
-	// tuned, there's not a good value to put here for a WithCancel
-	// without risking conflicts with the grpc retries/timeouts in the
-	// pluginmanager package.
-	ctx := context.TODO()
+	// We use this context only to attach hclog to the gRPC context. The
+	// lifetime is the lifetime of the gRPC stream, not specific RPC timeouts,
+	// but we manage the stream lifetime via Close in the pluginmanager.
+	ctx := context.Background()
 
 	volumes, err := c.claimVolumesFromAlloc()
 	if err != nil {