--- zzzz-none-000/linux-2.6.39.4/drivers/usb/storage/usb.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/usb/storage/usb.c	2021-11-10 13:38:17.000000000 +0000
@@ -78,7 +78,12 @@
 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
 MODULE_LICENSE("GPL");
 
+/* == 20160718 AVM/WKR need delay for UMTS modeswitch ==*/
+#if defined (CONFIG_USB_SERIAL_OPTION) || defined (CONFIG_USB_SERIAL_OPTION_MODULE)
+static unsigned int delay_use = 5;
+#else
 static unsigned int delay_use = 1;
+#endif
 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
 
@@ -1012,6 +1017,19 @@
 	struct us_data *us;
 	int result;
 
+	/* == AVM/WK 20140917 Patch from AVM Kernel 2.6.32
+	 * Filter out all AVM (057C) mass storage devices...
+	 */
+	struct usb_device *udev;
+	#define AVM_VENDOR_ID				0x057C
+	udev = interface_to_usbdev(intf);
+	if (le16_to_cpu(udev->descriptor.idVendor) == AVM_VENDOR_ID) {
+		printk (KERN_INFO "USB Mass Storage device (%04x:%04x) ignored!\n",
+			le16_to_cpu(udev->descriptor.idVendor),
+			le16_to_cpu(udev->descriptor.idProduct));
+		return -ENODEV;
+	}
+
 	/*
 	 * If libusual is configured, let it decide whether a standard
 	 * device should be handled by usb-storage or by ub.