diff --git a/Documentation/input/yealink.txt b/Documentation/input/yealink.txt
index 85f095a..0962c5c 100644
--- a/Documentation/input/yealink.txt
+++ b/Documentation/input/yealink.txt
@@ -2,7 +2,6 @@
 
 0. Status
 ~~~~~~~~~
-
 The p1k is a relatively cheap usb 1.1 phone with:
   - keyboard		full support, yealink.ko / input event API
   - LCD			full support, yealink.ko / sysfs API
@@ -17,9 +16,8 @@
 
 1. Compilation (stand alone version)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 Currently only kernel 2.6.x.y versions are supported.
-In order to build the yealink.ko module do:
+In order to build the yealink.ko module do
 
   make
 
@@ -28,6 +26,21 @@
 are located, default /usr/src/linux.
 
 
+1.1 Troubleshooting
+~~~~~~~~~~~~~~~~~~~
+Q: Module yealink compiled and installed without any problem but phone
+   is not initialized and does not react to any actions.
+A: If you see something like:
+   hiddev0: USB HID v1.00 Device [Yealink Network Technology Ltd. VOIP USB Phone
+   in dmesg, it means that the hid driver has grabbed the device first. Try to
+   load module yealink before any other usb hid driver. Please see the
+   instructions provided by your distribution on module configuration.
+
+Q: Phone is working now (displays version and accepts keypad input) but I can't
+   find the sysfs files.
+A: The sysfs files are located on the particular usb endpoint. On most
+   distributions you can do: "find /sys/ -name get_icons" for a hint.
+
 
 2. keyboard features
 ~~~~~~~~~~~~~~~~~~~~
diff --git a/MAINTAINERS b/MAINTAINERS
index 3928dc7..2868b28 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -116,12 +116,6 @@
 L:	linux-hams@vger.kernel.org
 S:	Maintained
 
-YEALINK PHONE DRIVER
-P:	Henk Vergonet
-M:	Henk.Vergonet@gmail.com
-L:	usbb2k-api-dev@nongnu.org
-S:	Maintained
-
 8139CP 10/100 FAST ETHERNET DRIVER
 P:	Jeff Garzik
 M:	jgarzik@pobox.com
@@ -2863,6 +2857,12 @@
 L:	linux-hams@vger.kernel.org
 S:	Maintained
 
+YEALINK PHONE DRIVER
+P:	Henk Vergonet
+M:	Henk.Vergonet@gmail.com
+L:	usbb2k-api-dev@nongnu.org
+S:	Maintained
+
 YMFPCI YAMAHA PCI SOUND (Use ALSA instead)
 P:	Pete Zaitcev
 M:	zaitcev@yahoo.com
diff --git a/drivers/usb/input/map_to_7segment.h b/drivers/usb/input/map_to_7segment.h
index 52ff27f..a424094 100644
--- a/drivers/usb/input/map_to_7segment.h
+++ b/drivers/usb/input/map_to_7segment.h
@@ -79,7 +79,7 @@
 
 static inline int map_to_seg7(struct seg7_conversion_map *map, int c)
 {
-	return c & 0x7f ? map->table[c] : -EINVAL;
+	return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL;
 }
 
 #define SEG7_CONVERSION_MAP(_name, _map)	\