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From: Takashi Iwai <tiwai@suse.de>
To: alsa-devel@alsa-project.org
Subject: [alsa-devel] [PATCH 2/2] ALSA: pcm: Create proc files only for non-empty preallocations
Date: Tue,  5 Nov 2019 20:10:07 +0100
Message-ID: <20191105191007.18150-3-tiwai@suse.de> (raw)
In-Reply-To: <20191105191007.18150-1-tiwai@suse.de>

It makes little sense to create prealloc proc files for streams that
have the zero max size, which is a typical case for vmalloc buffers.
Skip the proc file creations to save resources in such a case.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/pcm_memory.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 19407f79b638..17ee361ce791 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -203,7 +203,8 @@ static void snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
 	if (substream->dma_buffer.bytes > 0)
 		substream->buffer_bytes_max = substream->dma_buffer.bytes;
 	substream->dma_max = max;
-	preallocate_info_init(substream);
+	if (max > 0)
+		preallocate_info_init(substream);
 }
 
 
-- 
2.16.4

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05 19:10 [alsa-devel] [PATCH 0/2] ALSA: pcm: minor enhancements Takashi Iwai
2019-11-05 19:10 ` [alsa-devel] [PATCH 1/2] ALSA: pcm: Warn if doubly preallocated Takashi Iwai
2019-11-05 19:10 ` Takashi Iwai [this message]

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