[PATCH] USB: Buffer overflow patch for Yealink driver

Just a small patch that fixes a small parameter validation bug.

  drivers/usb/input/map_to_7segment.h:
    This patch fixes the broken parameter validation in the char to seg7
    conversion. This could cause out-of-bounds memory references.

  MAINTAINERS:
    Yealink maintainer info now in sorted order.

  Documentation/input/yealink.txt:
    Added a Q&A section that answers some common questions.

Signed-off-by: Henk <Henk.Vergonet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

006491df1a13f85ad245d1039dfdf20e49c394fd

Documentation/input/yealink.txt

@@ -2,7 +2,6 @@ Driver documentation for yealink usb-p1k phones
 
 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 @@ For vendor documentation see http://www.yealink.com
 
 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 @@ the Makefile is pointing to the location where your kernel sources
 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
 ~~~~~~~~~~~~~~~~~~~~