linux.git/sound/core/control.c, branch v3.0.48

ALSA: core: remove unused variables.

2011-05-26T06:19:04+00:00

Drop a few variables that are never read.

Signed-off-by: Luca Tettamanti 
Signed-off-by: Takashi Iwai

ALSA: Add snd_ctl_replace() to dynamically replace a control

2011-03-22T12:22:39+00:00

Add a function to dynamically replace a given control.  If the
control does not already exist, a third parameter is used to determine
whether to actually add that control.  This is useful in cases where
downloadable firmware at runtime can add or replace existing controls.
A separate patch needs to be made to allow ALSA Mixer to render the
replaced controls on the fly.

Signed-off-by: Dimitris Papastamos 
Signed-off-by: Takashi Iwai

Merge branch 'topic/misc' into for-linus

2011-03-18T06:39:08+00:00

ALSA: Add snd_ctl_activate_id()

2011-03-11T10:49:15+00:00

Added a new API function snd_ctl_activate_id() for activate / inactivate
the control element dynamically.

Signed-off-by: Takashi Iwai 
Signed-off-by: Mark Brown

ALSA: control: clean up snd_ctl_hole_check()

2011-03-08T12:00:09+00:00

The return value of snd_ctl_hole_check() is used only to detect whether
to continue the loop in snd_ctl_find_hole() or not, so we can simplify
the code by changing this return type to a boolean.  Also rename this
function to better show what it actually does.

Signed-off-by: Clemens Ladisch 
Signed-off-by: Takashi Iwai

ALSA: control: fix numid conflict check for new controls

2011-03-08T11:59:48+00:00

The purpose of the snd_ctl_hole_check() function is to find conflicts
between the numerical IDs of the new control and those of any existing
controls.  However, it would fail to detect an existing control whose
count is smaller than the new control's count and whose interval of IDs
is entirely contained in the interval of the new control's IDs.

To fix this, use the correct formula to detect overlapping intervals,
which happens to simplify the condition.

This problem was not encountered so far because ALSA does not yet allow
drivers to allocate specific control IDs.

Signed-off-by: Clemens Ladisch 
Signed-off-by: Takashi Iwai

ALSA: core, oxygen, virtuoso: add an enum control info helper

2011-01-10T15:46:53+00:00

Introduce the helper function snd_ctl_enum_info() to fill out the
elem_info fields for an enumerated control.

Signed-off-by: Clemens Ladisch 
Signed-off-by: Takashi Iwai

ALSA: prevent heap corruption in snd_ctl_new()

2010-09-28T19:33:16+00:00

The snd_ctl_new() function in sound/core/control.c allocates space for a
snd_kcontrol struct by performing arithmetic operations on a
user-provided size without checking for integer overflow.  If a user
provides a large enough size, an overflow will occur, the allocated
chunk will be too small, and a second user-influenced value will be
written repeatedly past the bounds of this chunk.  This code is
reachable by unprivileged users who have permission to open
a /dev/snd/controlC* device (on many distros, this is group "audio") via
the SNDRV_CTL_IOCTL_ELEM_ADD and SNDRV_CTL_IOCTL_ELEM_REPLACE ioctls.

Signed-off-by: Dan Rosenberg 
Cc: 
Signed-off-by: Takashi Iwai

ALSA: core - Define llseek fops

2010-04-13T10:01:21+00:00

Set no_llseek to llseek file ops of each sound component (but for hwdep).
This avoids the implicit BKL invocation via generic_file_llseek() used
as default when fops.llseek is NULL.

Also call nonseekable_open() at each open ops to ensure the file flags
have no seek bit.

Signed-off-by: Takashi Iwai

sound: control: fix minimum TLV length

2010-02-01T13:12:12+00:00

Allow TLV blocks that do not have any values; the smallest possible TLV
is an empty container or one where the information is only in the tag.

Signed-off-by: Clemens Ladisch 
Signed-off-by: Jaroslav Kysela