Merge branch 'for-linus' of git://git.alsa-project.org/alsa-kernel

* 'for-linus' of git://git.alsa-project.org/alsa-kernel: (258 commits)
  ALSA: hda: VREF powerdown for headphones
  ALSA: hda: STAC_HP_M4
  ALSA: ASoC: Check for machine type in GTA01 machine driver
  ALSA: mtpav - Fix race in probe
  ALSA: usb-audio: dynamic detection of MIDI interfaces in uaxx-quirk
  ALSA: Add a note on dependency of RTC stuff
  ALSA: ASoC: add new param mux to dapm_mux_update_power
  ALSA: Increase components array size
  ALSA: ASoC: Correct inverted Mic PGA Switch control in wm8510 driver
  ALSA: hda: comment typo fix
  ALSA: hda: comment typo fix
  ALSA: hda - Fix PCI SSID for ASROCK K18N78FullHD-hSLI
  ALSA: snd-usb-audio: support for Edirol UA-4FX device
  ALSA: usb - Fix possible Oops at USB-MIDI disconnection
  ALSA: hda - Fix another ALC889A (rev 0x100101)
  ALSA: hda: add more board-specific information for Realtek ALC662 rev1
  ALSA: Correct Vladimir Barinov's e-mail address
  ALSA: cs46xx: Add PCI IDs for TerraTec and Hercules cards
  ALSA: hda: SPDIF stream muting support
  ALSA: hda: appletv support
  ...

1 files changed, 38 insertions, 24 deletions

diff --git a/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl b/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
index e13c4e67029..b54cb5048df 100644
--- a/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
+++ b/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
@@ -6135,44 +6135,58 @@ struct _snd_pcm_runtime {
       </para>
     </section>
 
-    <section id="useful-functions-snd-assert">
-      <title><function>snd_assert()</function></title>
+    <section id="useful-functions-snd-bug">
+      <title><function>snd_BUG()</function></title>
       <para>
-        <function>snd_assert()</function> macro is similar with the
-      normal <function>assert()</function> macro. For example,  
+        It shows the <computeroutput>BUG?</computeroutput> message and
+      stack trace as well as <function>snd_BUG_ON</function> at the point.
+      It's useful to show that a fatal error happens there. 
+      </para>
+      <para>
+	 When no debug flag is set, this macro is ignored. 
+      </para>
+    </section>
+
+    <section id="useful-functions-snd-bug-on">
+      <title><function>snd_BUG_ON()</function></title>
+      <para>
+        <function>snd_BUG_ON()</function> macro is similar with
+	<function>WARN_ON()</function> macro. For example,  
 
         <informalexample>
           <programlisting>
 <![CDATA[
-  snd_assert(pointer != NULL, return -EINVAL);
+  snd_BUG_ON(!pointer);
 ]]>
           </programlisting>
         </informalexample>
-      </para>
 
-      <para>
-        The first argument is the expression to evaluate, and the
-      second argument is the action if it fails. When
-      <constant>CONFIG_SND_DEBUG</constant>, is set, it will show an
-      error message such as <computeroutput>BUG? (xxx)</computeroutput>
-      together with stack trace.
-      </para>
-      <para>
-	 When no debug flag is set, this macro is ignored. 
-      </para>
-    </section>
+	or it can be used as the condition,
+        <informalexample>
+          <programlisting>
+<![CDATA[
+  if (snd_BUG_ON(non_zero_is_bug))
+          return -EINVAL;
+]]>
+          </programlisting>
+        </informalexample>
 
-    <section id="useful-functions-snd-bug">
-      <title><function>snd_BUG()</function></title>
-      <para>
-        It shows the <computeroutput>BUG?</computeroutput> message and
-      stack trace as well as <function>snd_assert</function> at the point.
-      It's useful to show that a fatal error happens there. 
       </para>
+
       <para>
-	 When no debug flag is set, this macro is ignored. 
+        The macro takes an conditional expression to evaluate.
+	When <constant>CONFIG_SND_DEBUG</constant>, is set, the
+	expression is actually evaluated. If it's non-zero, it shows
+	the warning message such as
+	<computeroutput>BUG? (xxx)</computeroutput>
+	normally followed by stack trace.  It returns the evaluated
+	value.
+	When no <constant>CONFIG_SND_DEBUG</constant> is set, this
+	macro always returns zero.
       </para>
+
     </section>
+
   </chapter>