Staging: echo: fix up remaining checkpatch.pl issues

It's all just minor comment spacing issues.  This patch fixes
up the remaining ones and now the code is checkpatch.pl clean.

Cc: Steve Underwood <steveu@coppice.org>
Cc: David Rowe <david@rowetel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/echo/TODO

 TODO:
-	- checkpatch.pl cleanups
 	- handle bit_operations.h (merge in or make part of common code?)
 	- remove proc interface, only use echo.h interface (proc interface is
 	  racy and not correct.)

drivers/staging/echo/echo.c

@@ -102,7 +102,7 @@
    Mark, Pawel, and Pavel.
 */
 
-#include <linux/kernel.h>	/* We're doing kernel work */
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 
@@ -114,9 +114,6 @@
 #define DTD_HANGOVER			600	/* 600 samples, or 75ms     */
 #define DC_LOG2BETA			3	/* log2() of DC filter Beta */
 
-/*-----------------------------------------------------------------------*\
-				   FUNCTIONS
-\*-----------------------------------------------------------------------*/
 
 /* adapting coeffs using the traditional stochastic descent (N)LMS algorithm */
 
@@ -328,7 +325,7 @@ void oslec_snapshot(struct oslec_state *ec)
 }
 EXPORT_SYMBOL_GPL(oslec_snapshot);
 
-/* Dual Path Echo Canceller ------------------------------------------------*/
+/* Dual Path Echo Canceller */
 
 int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 {
@@ -336,9 +333,11 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	int clean_bg;
 	int tmp, tmp1;
 
-	/* Input scaling was found be required to prevent problems when tx
-	   starts clipping.  Another possible way to handle this would be the
-	   filter coefficent scaling. */
+	/*
+	 * Input scaling was found be required to prevent problems when tx
+	 * starts clipping.  Another possible way to handle this would be the
+	 * filter coefficent scaling.
+	 */
 
 	ec->tx = tx;
 	ec->rx = rx;
@@ -346,33 +345,40 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	rx >>= 1;
 
 	/*
-	   Filter DC, 3dB point is 160Hz (I think), note 32 bit precision required
-	   otherwise values do not track down to 0. Zero at DC, Pole at (1-Beta)
-	   only real axis.  Some chip sets (like Si labs) don't need
-	   this, but something like a $10 X100P card does.  Any DC really slows
-	   down convergence.
-
-	   Note: removes some low frequency from the signal, this reduces
-	   the speech quality when listening to samples through headphones
-	   but may not be obvious through a telephone handset.
-
-	   Note that the 3dB frequency in radians is approx Beta, e.g. for
-	   Beta = 2^(-3) = 0.125, 3dB freq is 0.125 rads = 159Hz.
+	 * Filter DC, 3dB point is 160Hz (I think), note 32 bit precision
+	 * required otherwise values do not track down to 0. Zero at DC, Pole
+	 * at (1-Beta) only real axis.  Some chip sets (like Si labs) don't
+	 * need this, but something like a $10 X100P card does.  Any DC really
+	 * slows down convergence.
+	 *
+	 * Note: removes some low frequency from the signal, this reduces the
+	 * speech quality when listening to samples through headphones but may
+	 * not be obvious through a telephone handset.
+	 *
+	 * Note that the 3dB frequency in radians is approx Beta, e.g. for Beta
+	 * = 2^(-3) = 0.125, 3dB freq is 0.125 rads = 159Hz.
 	 */
 
 	if (ec->adaption_mode & ECHO_CAN_USE_RX_HPF) {
 		tmp = rx << 15;
 #if 1
-		/* Make sure the gain of the HPF is 1.0. This can still saturate a little under
-		   impulse conditions, and it might roll to 32768 and need clipping on sustained peak
-		   level signals. However, the scale of such clipping is small, and the error due to
-		   any saturation should not markedly affect the downstream processing. */
+		/*
+		 * Make sure the gain of the HPF is 1.0. This can still
+		 * saturate a little under impulse conditions, and it might
+		 * roll to 32768 and need clipping on sustained peak level
+		 * signals. However, the scale of such clipping is small, and
+		 * the error due to any saturation should not markedly affect
+		 * the downstream processing.
+		 */
 		tmp -= (tmp >> 4);
 #endif
 		ec->rx_1 += -(ec->rx_1 >> DC_LOG2BETA) + tmp - ec->rx_2;
 
-		/* hard limit filter to prevent clipping.  Note that at this stage
-		   rx should be limited to +/- 16383 due to right shift above */
+		/*
+		 * hard limit filter to prevent clipping.  Note that at this
+		 * stage rx should be limited to +/- 16383 due to right shift
+		 * above
+		 */
 		tmp1 = ec->rx_1 >> 15;
 		if (tmp1 > 16383)
 			tmp1 = 16383;
@@ -407,7 +413,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	ec->Lrxacc += abs(rx) - ec->Lrx;
 	ec->Lrx = (ec->Lrxacc + (1 << 4)) >> 5;
 
-	/* Foreground filter --------------------------------------------------- */
+	/* Foreground filter */
 
 	ec->fir_state.coeffs = ec->fir_taps16[0];
 	echo_value = fir16(&ec->fir_state, tx);
@@ -415,14 +421,14 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	ec->Lcleanacc += abs(ec->clean) - ec->Lclean;
 	ec->Lclean = (ec->Lcleanacc + (1 << 4)) >> 5;
 
-	/* Background filter --------------------------------------------------- */
+	/* Background filter */
 
 	echo_value = fir16(&ec->fir_state_bg, tx);
 	clean_bg = rx - echo_value;
 	ec->Lclean_bgacc += abs(clean_bg) - ec->Lclean_bg;
 	ec->Lclean_bg = (ec->Lclean_bgacc + (1 << 4)) >> 5;
 
-	/* Background Filter adaption ----------------------------------------- */
+	/* Background Filter adaption */
 
 	/* Almost always adap bg filter, just simple DT and energy
 	   detection to minimise adaption in cases of strong double talk.
@@ -483,7 +489,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	if (ec->nonupdate_dwell)
 		ec->nonupdate_dwell--;
 
-	/* Transfer logic ------------------------------------------------------ */
+	/* Transfer logic */
 
 	/* These conditions are from the dual path paper [1], I messed with
 	   them a bit to improve performance. */
@@ -495,7 +501,10 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	    /* (ec->Lclean_bg < 0.125*ec->Ltx) */
 	    (8 * ec->Lclean_bg < ec->Ltx)) {
 		if (ec->cond_met == 6) {
-			/* BG filter has had better results for 6 consecutive samples */
+			/*
+			 * BG filter has had better results for 6 consecutive
+			 * samples
+			 */
 			ec->adapt = 1;
 			memcpy(ec->fir_taps16[0], ec->fir_taps16[1],
 				ec->taps * sizeof(int16_t));
@@ -504,25 +513,34 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	} else
 		ec->cond_met = 0;
 
-	/* Non-Linear Processing --------------------------------------------------- */
+	/* Non-Linear Processing */
 
 	ec->clean_nlp = ec->clean;
 	if (ec->adaption_mode & ECHO_CAN_USE_NLP) {
-		/* Non-linear processor - a fancy way to say "zap small signals, to avoid
-		   residual echo due to (uLaw/ALaw) non-linearity in the channel.". */
+		/*
+		 * Non-linear processor - a fancy way to say "zap small
+		 * signals, to avoid residual echo due to (uLaw/ALaw)
+		 * non-linearity in the channel.".
+		 */
 
 		if ((16 * ec->Lclean < ec->Ltx)) {
-			/* Our e/c has improved echo by at least 24 dB (each factor of 2 is 6dB,
-			   so 2*2*2*2=16 is the same as 6+6+6+6=24dB) */
+			/*
+			 * Our e/c has improved echo by at least 24 dB (each
+			 * factor of 2 is 6dB, so 2*2*2*2=16 is the same as
+			 * 6+6+6+6=24dB)
+			 */
 			if (ec->adaption_mode & ECHO_CAN_USE_CNG) {
 				ec->cng_level = ec->Lbgn;
 
-				/* Very elementary comfort noise generation.  Just random
-				   numbers rolled off very vaguely Hoth-like.  DR: This
-				   noise doesn't sound quite right to me - I suspect there
-				   are some overlfow issues in the filtering as it's too
-				   "crackly".  TODO: debug this, maybe just play noise at
-				   high level or look at spectrum.
+				/*
+				 * Very elementary comfort noise generation.
+				 * Just random numbers rolled off very vaguely
+				 * Hoth-like.  DR: This noise doesn't sound
+				 * quite right to me - I suspect there are some
+				 * overlfow issues in the filtering as it's too
+				 * "crackly".
+				 * TODO: debug this, maybe just play noise at
+				 * high level or look at spectrum.
 				 */
 
 				ec->cng_rndnum =
@@ -540,18 +558,22 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 				if (ec->clean_nlp < -ec->Lbgn)
 					ec->clean_nlp = -ec->Lbgn;
 			} else {
-				/* just mute the residual, doesn't sound very good, used mainly
-				   in G168 tests */
+				/*
+				 * just mute the residual, doesn't sound very
+				 * good, used mainly in G168 tests
+				 */
 				ec->clean_nlp = 0;
 			}
 		} else {
-			/* Background noise estimator.  I tried a few algorithms
-			   here without much luck.  This very simple one seems to
-			   work best, we just average the level using a slow (1 sec
-			   time const) filter if the current level is less than a
-			   (experimentally derived) constant.  This means we dont
-			   include high level signals like near end speech.  When
-			   combined with CNG or especially CLIP seems to work OK.
+			/*
+			 * Background noise estimator.  I tried a few
+			 * algorithms here without much luck.  This very simple
+			 * one seems to work best, we just average the level
+			 * using a slow (1 sec time const) filter if the
+			 * current level is less than a (experimentally
+			 * derived) constant.  This means we dont include high
+			 * level signals like near end speech.  When combined
+			 * with CNG or especially CLIP seems to work OK.
 			 */
 			if (ec->Lclean < 40) {
 				ec->Lbgn_acc += abs(ec->clean) - ec->Lbgn;
@@ -587,12 +609,13 @@ EXPORT_SYMBOL_GPL(oslec_update);
    It can also help by removing and DC in the tx signal.  DC is bad
    for LMS algorithms.
 
-   This is one of the classic DC removal filters, adjusted to provide sufficient
-   bass rolloff to meet the above requirement to protect hybrids from things that
-   upset them. The difference between successive samples produces a lousy HPF, and
-   then a suitably placed pole flattens things out. The final result is a nicely
-   rolled off bass end. The filtering is implemented with extended fractional
-   precision, which noise shapes things, giving very clean DC removal.
+   This is one of the classic DC removal filters, adjusted to provide
+   sufficient bass rolloff to meet the above requirement to protect hybrids
+   from things that upset them. The difference between successive samples
+   produces a lousy HPF, and then a suitably placed pole flattens things out.
+   The final result is a nicely rolled off bass end. The filtering is
+   implemented with extended fractional precision, which noise shapes things,
+   giving very clean DC removal.
 */
 
 int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx)
@@ -602,10 +625,14 @@ int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx)
 	if (ec->adaption_mode & ECHO_CAN_USE_TX_HPF) {
 		tmp = tx << 15;
 #if 1
-		/* Make sure the gain of the HPF is 1.0. The first can still saturate a little under
-		   impulse conditions, and it might roll to 32768 and need clipping on sustained peak
-		   level signals. However, the scale of such clipping is small, and the error due to
-		   any saturation should not markedly affect the downstream processing. */
+		/*
+		 * Make sure the gain of the HPF is 1.0. The first can still
+		 * saturate a little under impulse conditions, and it might
+		 * roll to 32768 and need clipping on sustained peak level
+		 * signals. However, the scale of such clipping is small, and
+		 * the error due to any saturation should not markedly affect
+		 * the downstream processing.
+		 */
 		tmp -= (tmp >> 4);
 #endif
 		ec->tx_1 += -(ec->tx_1 >> DC_LOG2BETA) + tmp - ec->tx_2;