ALSA: constify snd_pcm_ops structures

Check for snd_pcm_ops structures that are only stored in the ops field of a
snd_soc_platform_driver structure or passed as the third argument to
snd_pcm_set_ops.  The corresponding field or parameter is declared const,
so snd_pcm_ops structures that have this property can be declared as const
also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct snd_pcm_ops i@p = { ... };

@ok1@
identifier r.i;
struct snd_soc_platform_driver e;
position p;
@@
e.ops = &i@p;

@ok2@
identifier r.i;
expression e1, e2;
position p;
@@
snd_pcm_set_ops(e1, e2, &i@p)

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct snd_pcm_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct snd_pcm_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
index 4735e27..103fe31 100644
--- a/sound/pci/nm256/nm256.c
+++ b/sound/pci/nm256/nm256.c
@@ -902,7 +902,7 @@ snd_nm256_capture_close(struct snd_pcm_substream *substream)
 /*
  * create a pcm instance
  */
-static struct snd_pcm_ops snd_nm256_playback_ops = {
+static const struct snd_pcm_ops snd_nm256_playback_ops = {
 	.open =		snd_nm256_playback_open,
 	.close =	snd_nm256_playback_close,
 	.ioctl =	snd_pcm_lib_ioctl,
@@ -917,7 +917,7 @@ static struct snd_pcm_ops snd_nm256_playback_ops = {
 	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_nm256_capture_ops = {
+static const struct snd_pcm_ops snd_nm256_capture_ops = {
 	.open =		snd_nm256_capture_open,
 	.close =	snd_nm256_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,