linux-kernel - [PATCH 2/2] ALSA: pcm/oss: mark snd_pcm_plug_slave

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Message-Id: <20170518133610.1914235-2-arnd@arndb.de>
Date:   Thu, 18 May 2017 15:35:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Takashi Iwai <tiwai@...e.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Sakamoto <o-takashi@...amocchi.jp>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] ALSA: pcm/oss: mark snd_pcm_plug_slave_format arg as const

Only one of the two declarations has the const modifier in the
argument list, so we get a warning when CONFIG_SND_PCM_OSS_PLUGINS
is disabled:

sound/core/oss/pcm_oss.c: In function 'snd_pcm_oss_change_params':
sound/core/oss/pcm_oss.c:898:47: error: passing argument 2 of 'snd_pcm_plug_slave_format' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]

This makes the two declarations match again.

Fixes: e76bf3c4b4e4 ("ALSA: pcm/oss: refer to parameters instead of copying to reduce usage of kernel stack")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/core/oss/pcm_plugin.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/oss/pcm_plugin.h b/sound/core/oss/pcm_plugin.h
index 38e2c14cb893..73c068abaca5 100644
--- a/sound/core/oss/pcm_plugin.h
+++ b/sound/core/oss/pcm_plugin.h
@@ -172,7 +172,7 @@ snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream,
 
 static inline snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size) { return drv_size; }
 static inline snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size) { return clt_size; }
-static inline int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask) { return format; }
+static inline int snd_pcm_plug_slave_format(int format, const struct snd_mask *format_mask) { return format; }
 
 #endif
 
-- 
2.9.0