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ALSA: control: remove entry limitation for list operation

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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 53e7bf4525 ("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>
This commit is contained in:
Takashi Sakamoto 2017-05-24 10:04:30 +09:00 committed by Takashi Iwai
parent ffb73b08e7
commit 4e361d3c96
1 changed files with 1 additions and 3 deletions
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4
sound/core/control.c
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@ -757,9 +757,7 @@ static int snd_ctl_elem_list(struct snd_card *card,
return -EFAULT; return -EFAULT;
offset = list.offset; offset = list.offset;
space = list.space; space = list.space;
/* try limit maximum space */
if (space > 16384)
return -ENOMEM;
down_read(&card->controls_rwsem); down_read(&card->controls_rwsem);
list.count = card->controls_count; list.count = card->controls_count;
list.used = 0; list.used = 0;