linux-kernel - [PATCH v3 01/17] ASoC: fsl_ssi: Redefine RX and TX macros

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Date:   Sun, 14 Jan 2018 20:21:11 -0800
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     timur@...i.org, broonie@...nel.org, mail@...iej.szmigiero.name
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        alsa-devel@...a-project.org, lgirdwood@...il.com,
        fabio.estevam@....com, caleb@...me.org, arnaud.mouiche@...oxia.com,
        lukma@...x.de, kernel@...gutronix.de
Subject: [PATCH v3 01/17] ASoC: fsl_ssi: Redefine RX and TX macros

The RX and TX macros were defined implicitly and there was
a potential risk if someone changes their values.

Since they were defined to index the array ssi->regvals[2],
this patch moves these two macros to fsl_ssi.c, closer to
its owner ssi->regvals. And it also puts some comments here
to limit their value within [0, 1].

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 sound/soc/fsl/fsl_ssi.c | 4 ++++
 sound/soc/fsl/fsl_ssi.h | 3 ---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index aecd00f..001e453 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -56,6 +56,10 @@
 #include "fsl_ssi.h"
 #include "imx-pcm.h"
 
+/* Define RX and TX to index ssi->regvals array; Can be 0 or 1 only */
+#define RX 0
+#define TX 1
+
 /**
  * FSLSSI_I2S_FORMATS: audio formats supported by the SSI
  *
diff --git a/sound/soc/fsl/fsl_ssi.h b/sound/soc/fsl/fsl_ssi.h
index de2fdc5..18f8dd5 100644
--- a/sound/soc/fsl/fsl_ssi.h
+++ b/sound/soc/fsl/fsl_ssi.h
@@ -12,9 +12,6 @@
 #ifndef _MPC8610_I2S_H
 #define _MPC8610_I2S_H
 
-#define RX 0
-#define TX 1
-
 /* -- SSI Register Map -- */
 
 /* SSI Transmit Data Register 0 */
-- 
2.7.4