ALSA: Make snd_BUG_ON() always evaluate and return the conditional expression

Having snd_BUG_ON() only evaluate its conditional when CONFIG_SND_DEBUG
is set leads to frequent bugs, since other similar macros in the kernel
have different behavior. Let's make snd_BUG_ON() act like those macros
so it will stop being accidentally misused.

Signed-off-by: Christine Spang <christine.spang@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 13 insertions, 23 deletions

diff --git a/Documentation/DocBook/writing-an-alsa-driver.tmpl b/Documentation/DocBook/writing-an-alsa-driver.tmpl
index bd6fee22c4dd..06741e925985 100644
--- a/Documentation/DocBook/writing-an-alsa-driver.tmpl
+++ b/Documentation/DocBook/writing-an-alsa-driver.tmpl
@@ -6164,14 +6164,12 @@ struct _snd_pcm_runtime {
 
       <para>
         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
+        When <constant>CONFIG_SND_DEBUG</constant>, is set, if the
+        expression is 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.
+        normally followed by stack trace.
+
+        In both cases it returns the evaluated value.
       </para>
 
     </section>
diff --git a/include/sound/core.h b/include/sound/core.h
index 7cede2d6aa86..a63680b9819d 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -379,18 +379,10 @@ void __snd_printk(unsigned int level, const char *file, int line,
  * snd_BUG_ON - debugging check macro
  * @cond: condition to evaluate
  *
- * When CONFIG_SND_DEBUG is set, this macro evaluates the given condition,
- * and call WARN() and returns the value if it's non-zero.
- * 
- * When CONFIG_SND_DEBUG is not set, this just returns zero, and the given
- * condition is ignored.
- *
- * NOTE: the argument won't be evaluated at all when CONFIG_SND_DEBUG=n.
- * Thus, don't put any statement that influences on the code behavior,
- * such as pre/post increment, to the argument of this macro.
- * If you want to evaluate and give a warning, use standard WARN_ON().
+ * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set,
+ * otherwise just evaluates the conditional and returns the value.
  */
-#define snd_BUG_ON(cond)        WARN((cond), "BUG? (%s)\n", __stringify(cond))
+#define snd_BUG_ON(cond)        WARN_ON((cond))
 
 #else /* !CONFIG_SND_DEBUG */
 
@@ -400,11 +392,11 @@ __printf(2, 3)
 static inline void _snd_printd(int level, const char *format, ...) {}
 
 #define snd_BUG()                       do { } while (0)
-static inline int __snd_bug_on(int cond)
-{
-        return 0;
-}
-#define snd_BUG_ON(cond)        __snd_bug_on(0 && (cond))  /* always false */
+
+#define snd_BUG_ON(condition) ({ \
+        int __ret_warn_on = !!(condition); \
+        unlikely(__ret_warn_on); \
+})
 
 #endif /* CONFIG_SND_DEBUG */