From 4e361d3c962dda16e27d81e7aa9202828a8f7371 Mon Sep 17 00:00:00 2001
From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Wed, 24 May 2017 10:04:30 +0900
Subject: [PATCH] ALSA: control: remove entry limitation for list operation
Git-commit: 4e361d3c962dda16e27d81e7aa9202828a8f7371
Patch-mainline: v4.13-rc1
References: bsc#1121278
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>
---
sound/core/control.c | 4 +---
1 file changed, 1 insertion(+), 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;
--
2.20.1