mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 07:04:24 +00:00
Code Issues Releases Wiki Activity

ASoC: soc-dapm.c: add comment for kzalloc()/kfree() on snd_soc_dai_link_event_pre_pmu()

Browse source 
snd_soc_dai_link_event_pre_pmu() is using kzalloc()/kfree() for params.
It looks we don't need to use these, but are necessary.
But, it is difficult to know why it is necessary without any comments.
This patch adds the reasons via comment.

Link: https://lore.kernel.org/all/Yxc2wzbZsSVZNf8Y@sirena.org.uk/
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/878rmubn47.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kuninori Morimoto 2022-09-08 02:45:12 +00:00 committed by Mark Brown
parent e0d38f88e9
commit 6ef8443fb1
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 11 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
sound/soc/soc-dapm.c
View file

@ -3842,6 +3842,15 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
unsigned int fmt;
int ret = 0;
/*
* NOTE
*
* snd_pcm_hw_params is quite large (608 bytes on arm64) and is
* starting to get a bit excessive for allocation on the stack,
* especially when you're building with some of the KASAN type
* stuff that increases stack usage.
* So, we use kzalloc()/kfree() for params in this function.
*/
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
@ -3939,7 +3948,9 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
runtime->rate = params_rate(params);
out:
/* see above NOTE */
kfree(params);
return ret;
}