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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2017-05-24 10:04:30 +0900
committerTakashi Iwai <tiwai@suse.de>2017-05-24 10:18:28 +0200
commit4e361d3c962dda16e27d81e7aa9202828a8f7371 (patch)
tree6dc34680cdce95917afbd707544320eb4b641271 /sound/core/control.c
parentffb73b08e79418fbf3f2ea44a7818a6715399d2c (diff)
downloadlinux-4e361d3c962dda16e27d81e7aa9202828a8f7371.tar.bz2
ALSA: control: remove entry limitation for list operation
In current implementation of ALSA control core, list operation has a limitation to handle 16384 entries at once. This seems due to allocation in kernel space to copy data from user space. With a commit 53e7bf452584 ("ALSA: control: Simplify snd_ctl_elem_list() implementation"), for the operation, ALSA control core copies data into user space directly. No need to care of kernel spaces anymore. This commit purges the limitation. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/control.c')
-rw-r--r--sound/core/control.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 47080da8451a..ecd358213b83 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -757,9 +757,7 @@ static int snd_ctl_elem_list(struct snd_card *card,
return -EFAULT;
offset = list.offset;
space = list.space;
- /* try limit maximum space */
- if (space > 16384)
- return -ENOMEM;
+
down_read(&card->controls_rwsem);
list.count = card->controls_count;
list.used = 0;