2009-05-14 14:05:58 +08:00
|
|
|
/**
|
|
|
|
|
* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
|
|
|
|
|
*
|
|
|
|
|
* This source file is released under GPL v2 license (no other versions).
|
|
|
|
|
* See the COPYING file included in the main directory of this source
|
|
|
|
|
* distribution for the license terms and conditions.
|
|
|
|
|
*
|
|
|
|
|
* @File ctpcm.c
|
|
|
|
|
*
|
|
|
|
|
* @Brief
|
|
|
|
|
* This file contains the definition of the pcm device functions.
|
|
|
|
|
*
|
|
|
|
|
* @Author Liu Chun
|
|
|
|
|
* @Date Apr 2 2008
|
|
|
|
|
*
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include "ctpcm.h"
|
2009-06-05 22:11:07 +08:00
|
|
|
#include "cttimer.h"
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
|
|
|
#include <linux/slab.h>
|
2009-05-14 14:05:58 +08:00
|
|
|
#include <sound/pcm.h>
|
|
|
|
|
|
|
|
|
|
/* Hardware descriptions for playback */
|
|
|
|
|
static struct snd_pcm_hardware ct_pcm_playback_hw = {
|
|
|
|
|
.info = (SNDRV_PCM_INFO_MMAP |
|
|
|
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
|
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
|
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
|
|
|
SNDRV_PCM_INFO_PAUSE),
|
|
|
|
|
.formats = (SNDRV_PCM_FMTBIT_U8 |
|
|
|
|
|
SNDRV_PCM_FMTBIT_S16_LE |
|
|
|
|
|
SNDRV_PCM_FMTBIT_S24_3LE |
|
2009-06-02 20:39:05 +08:00
|
|
|
SNDRV_PCM_FMTBIT_S32_LE |
|
|
|
|
|
SNDRV_PCM_FMTBIT_FLOAT_LE),
|
2009-05-14 14:05:58 +08:00
|
|
|
.rates = (SNDRV_PCM_RATE_CONTINUOUS |
|
|
|
|
|
SNDRV_PCM_RATE_8000_192000),
|
|
|
|
|
.rate_min = 8000,
|
|
|
|
|
.rate_max = 192000,
|
|
|
|
|
.channels_min = 1,
|
|
|
|
|
.channels_max = 2,
|
|
|
|
|
.buffer_bytes_max = (128*1024),
|
|
|
|
|
.period_bytes_min = (64),
|
|
|
|
|
.period_bytes_max = (128*1024),
|
2009-06-05 22:12:16 +08:00
|
|
|
.periods_min = 2,
|
2009-05-14 14:05:58 +08:00
|
|
|
.periods_max = 1024,
|
|
|
|
|
.fifo_size = 0,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static struct snd_pcm_hardware ct_spdif_passthru_playback_hw = {
|
|
|
|
|
.info = (SNDRV_PCM_INFO_MMAP |
|
|
|
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
|
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
|
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
|
|
|
SNDRV_PCM_INFO_PAUSE),
|
2009-06-02 20:39:05 +08:00
|
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,
|
2009-05-14 14:05:58 +08:00
|
|
|
.rates = (SNDRV_PCM_RATE_48000 |
|
|
|
|
|
SNDRV_PCM_RATE_44100 |
|
|
|
|
|
SNDRV_PCM_RATE_32000),
|
|
|
|
|
.rate_min = 32000,
|
|
|
|
|
.rate_max = 48000,
|
|
|
|
|
.channels_min = 2,
|
|
|
|
|
.channels_max = 2,
|
|
|
|
|
.buffer_bytes_max = (128*1024),
|
|
|
|
|
.period_bytes_min = (64),
|
|
|
|
|
.period_bytes_max = (128*1024),
|
2009-06-05 22:12:16 +08:00
|
|
|
.periods_min = 2,
|
2009-05-14 14:05:58 +08:00
|
|
|
.periods_max = 1024,
|
|
|
|
|
.fifo_size = 0,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* Hardware descriptions for capture */
|
|
|
|
|
static struct snd_pcm_hardware ct_pcm_capture_hw = {
|
|
|
|
|
.info = (SNDRV_PCM_INFO_MMAP |
|
|
|
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
|
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
|
|
|
SNDRV_PCM_INFO_PAUSE |
|
|
|
|
|
SNDRV_PCM_INFO_MMAP_VALID),
|
|
|
|
|
.formats = (SNDRV_PCM_FMTBIT_U8 |
|
|
|
|
|
SNDRV_PCM_FMTBIT_S16_LE |
|
|
|
|
|
SNDRV_PCM_FMTBIT_S24_3LE |
|
2009-06-02 20:39:05 +08:00
|
|
|
SNDRV_PCM_FMTBIT_S32_LE |
|
|
|
|
|
SNDRV_PCM_FMTBIT_FLOAT_LE),
|
2009-05-14 14:05:58 +08:00
|
|
|
.rates = (SNDRV_PCM_RATE_CONTINUOUS |
|
|
|
|
|
SNDRV_PCM_RATE_8000_96000),
|
|
|
|
|
.rate_min = 8000,
|
|
|
|
|
.rate_max = 96000,
|
|
|
|
|
.channels_min = 1,
|
|
|
|
|
.channels_max = 2,
|
|
|
|
|
.buffer_bytes_max = (128*1024),
|
|
|
|
|
.period_bytes_min = (384),
|
|
|
|
|
.period_bytes_max = (64*1024),
|
|
|
|
|
.periods_min = 2,
|
|
|
|
|
.periods_max = 1024,
|
|
|
|
|
.fifo_size = 0,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static void ct_atc_pcm_interrupt(struct ct_atc_pcm *atc_pcm)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc_pcm *apcm = atc_pcm;
|
|
|
|
|
|
2009-07-22 23:12:34 +08:00
|
|
|
if (!apcm->substream)
|
2009-05-14 14:05:58 +08:00
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
snd_pcm_period_elapsed(apcm->substream);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void ct_atc_pcm_free_substream(struct snd_pcm_runtime *runtime)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(apcm->substream);
|
|
|
|
|
|
|
|
|
|
atc->pcm_release_resources(atc, apcm);
|
2009-06-05 22:11:07 +08:00
|
|
|
ct_timer_instance_free(apcm->timer);
|
2009-05-14 14:05:58 +08:00
|
|
|
kfree(apcm);
|
|
|
|
|
runtime->private_data = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* pcm playback operations */
|
|
|
|
|
static int ct_pcm_playback_open(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
apcm = kzalloc(sizeof(*apcm), GFP_KERNEL);
|
2009-07-22 23:12:34 +08:00
|
|
|
if (!apcm)
|
2009-05-14 14:05:58 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
apcm->substream = substream;
|
|
|
|
|
apcm->interrupt = ct_atc_pcm_interrupt;
|
|
|
|
|
if (IEC958 == substream->pcm->device) {
|
|
|
|
|
runtime->hw = ct_spdif_passthru_playback_hw;
|
|
|
|
|
atc->spdif_out_passthru(atc, 1);
|
|
|
|
|
} else {
|
|
|
|
|
runtime->hw = ct_pcm_playback_hw;
|
|
|
|
|
if (FRONT == substream->pcm->device)
|
|
|
|
|
runtime->hw.channels_max = 8;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
err = snd_pcm_hw_constraint_integer(runtime,
|
|
|
|
|
SNDRV_PCM_HW_PARAM_PERIODS);
|
|
|
|
|
if (err < 0) {
|
|
|
|
|
kfree(apcm);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
err = snd_pcm_hw_constraint_minmax(runtime,
|
|
|
|
|
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
|
|
|
|
|
1024, UINT_MAX);
|
|
|
|
|
if (err < 0) {
|
|
|
|
|
kfree(apcm);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
2009-06-05 22:11:07 +08:00
|
|
|
apcm->timer = ct_timer_instance_new(atc->timer, apcm);
|
ALSA: sound/pci/ctxfi/ctpcm.c: Remove potential for use after free
In each function, the value apcm is stored in the private_data field of
runtime. At the same time the function ct_atc_pcm_free_substream is stored
in the private_free field of the same structure. ct_atc_pcm_free_substream
dereferences and ultimately frees the value in the private_data field. But
each function can exit in an error case with apcm having been freed, in
which case a subsequent call to the private_free function would perform a
dereference after free. On the other hand, if the private_free field is
not initialized, it is NULL, and not invoked (see snd_pcm_detach_substream
in sound/core/pcm.c). To avoid the introduction of a dangling pointer, the
initializations of the private_data and private_free fields are moved to
the end of the function, past any possible free of apcm. This is safe
because the previous calls to snd_pcm_hw_constraint_integer and
snd_pcm_hw_constraint_minmax, which take runtime as an argument, do not
refer to either of these fields.
In each function, there is one error case where apcm needs to be freed, and
a call to kfree is added.
The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression e,e1,e2,e3;
identifier f,free1,free2;
expression a;
@@
*e->f = a
... when != e->f = e1
when any
if (...) {
... when != free1(...,e,...)
when != e->f = e2
* kfree(a)
... when != free2(...,e,...)
when != e->f = e3
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-11-10 06:00:41 +08:00
|
|
|
if (!apcm->timer) {
|
|
|
|
|
kfree(apcm);
|
2009-06-05 22:11:07 +08:00
|
|
|
return -ENOMEM;
|
ALSA: sound/pci/ctxfi/ctpcm.c: Remove potential for use after free
In each function, the value apcm is stored in the private_data field of
runtime. At the same time the function ct_atc_pcm_free_substream is stored
in the private_free field of the same structure. ct_atc_pcm_free_substream
dereferences and ultimately frees the value in the private_data field. But
each function can exit in an error case with apcm having been freed, in
which case a subsequent call to the private_free function would perform a
dereference after free. On the other hand, if the private_free field is
not initialized, it is NULL, and not invoked (see snd_pcm_detach_substream
in sound/core/pcm.c). To avoid the introduction of a dangling pointer, the
initializations of the private_data and private_free fields are moved to
the end of the function, past any possible free of apcm. This is safe
because the previous calls to snd_pcm_hw_constraint_integer and
snd_pcm_hw_constraint_minmax, which take runtime as an argument, do not
refer to either of these fields.
In each function, there is one error case where apcm needs to be freed, and
a call to kfree is added.
The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression e,e1,e2,e3;
identifier f,free1,free2;
expression a;
@@
*e->f = a
... when != e->f = e1
when any
if (...) {
... when != free1(...,e,...)
when != e->f = e2
* kfree(a)
... when != free2(...,e,...)
when != e->f = e3
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-11-10 06:00:41 +08:00
|
|
|
}
|
|
|
|
|
runtime->private_data = apcm;
|
|
|
|
|
runtime->private_free = ct_atc_pcm_free_substream;
|
2009-06-05 22:11:07 +08:00
|
|
|
|
2009-05-14 14:05:58 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_playback_close(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
|
|
|
|
|
/* TODO: Notify mixer inactive. */
|
|
|
|
|
if (IEC958 == substream->pcm->device)
|
|
|
|
|
atc->spdif_out_passthru(atc, 0);
|
|
|
|
|
|
|
|
|
|
/* The ct_atc_pcm object will be freed by runtime->private_free */
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
|
|
|
struct snd_pcm_hw_params *hw_params)
|
|
|
|
|
{
|
2009-06-09 14:19:02 +08:00
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct ct_atc_pcm *apcm = substream->runtime->private_data;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
err = snd_pcm_lib_malloc_pages(substream,
|
2009-05-14 14:05:58 +08:00
|
|
|
params_buffer_bytes(hw_params));
|
2009-06-09 14:19:02 +08:00
|
|
|
if (err < 0)
|
|
|
|
|
return err;
|
|
|
|
|
/* clear previous resources */
|
|
|
|
|
atc->pcm_release_resources(atc, apcm);
|
|
|
|
|
return err;
|
2009-05-14 14:05:58 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
2009-06-09 14:19:02 +08:00
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct ct_atc_pcm *apcm = substream->runtime->private_data;
|
|
|
|
|
|
|
|
|
|
/* clear previous resources */
|
|
|
|
|
atc->pcm_release_resources(atc, apcm);
|
2009-05-14 14:05:58 +08:00
|
|
|
/* Free snd-allocated pages */
|
|
|
|
|
return snd_pcm_lib_free_pages(substream);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_playback_prepare(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
if (IEC958 == substream->pcm->device)
|
|
|
|
|
err = atc->spdif_passthru_playback_prepare(atc, apcm);
|
|
|
|
|
else
|
|
|
|
|
err = atc->pcm_playback_prepare(atc, apcm);
|
|
|
|
|
|
|
|
|
|
if (err < 0) {
|
2009-05-14 21:19:30 +08:00
|
|
|
printk(KERN_ERR "ctxfi: Preparing pcm playback failed!!!\n");
|
2009-05-14 14:05:58 +08:00
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
ct_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
|
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
|
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
|
|
|
atc->pcm_playback_start(atc, apcm);
|
|
|
|
|
break;
|
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
|
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
|
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
|
|
|
atc->pcm_playback_stop(atc, apcm);
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static snd_pcm_uframes_t
|
|
|
|
|
ct_pcm_playback_pointer(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
unsigned long position;
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
/* Read out playback position */
|
|
|
|
|
position = atc->pcm_playback_position(atc, apcm);
|
|
|
|
|
position = bytes_to_frames(runtime, position);
|
2009-06-08 21:07:46 +08:00
|
|
|
if (position >= runtime->buffer_size)
|
|
|
|
|
position = 0;
|
2009-05-14 14:05:58 +08:00
|
|
|
return position;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* pcm capture operations */
|
|
|
|
|
static int ct_pcm_capture_open(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
apcm = kzalloc(sizeof(*apcm), GFP_KERNEL);
|
2009-07-22 23:12:34 +08:00
|
|
|
if (!apcm)
|
2009-05-14 14:05:58 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
apcm->started = 0;
|
|
|
|
|
apcm->substream = substream;
|
|
|
|
|
apcm->interrupt = ct_atc_pcm_interrupt;
|
|
|
|
|
runtime->hw = ct_pcm_capture_hw;
|
|
|
|
|
runtime->hw.rate_max = atc->rsr * atc->msr;
|
|
|
|
|
|
|
|
|
|
err = snd_pcm_hw_constraint_integer(runtime,
|
|
|
|
|
SNDRV_PCM_HW_PARAM_PERIODS);
|
|
|
|
|
if (err < 0) {
|
|
|
|
|
kfree(apcm);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
err = snd_pcm_hw_constraint_minmax(runtime,
|
|
|
|
|
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
|
|
|
|
|
1024, UINT_MAX);
|
|
|
|
|
if (err < 0) {
|
|
|
|
|
kfree(apcm);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
2009-06-05 22:11:07 +08:00
|
|
|
apcm->timer = ct_timer_instance_new(atc->timer, apcm);
|
ALSA: sound/pci/ctxfi/ctpcm.c: Remove potential for use after free
In each function, the value apcm is stored in the private_data field of
runtime. At the same time the function ct_atc_pcm_free_substream is stored
in the private_free field of the same structure. ct_atc_pcm_free_substream
dereferences and ultimately frees the value in the private_data field. But
each function can exit in an error case with apcm having been freed, in
which case a subsequent call to the private_free function would perform a
dereference after free. On the other hand, if the private_free field is
not initialized, it is NULL, and not invoked (see snd_pcm_detach_substream
in sound/core/pcm.c). To avoid the introduction of a dangling pointer, the
initializations of the private_data and private_free fields are moved to
the end of the function, past any possible free of apcm. This is safe
because the previous calls to snd_pcm_hw_constraint_integer and
snd_pcm_hw_constraint_minmax, which take runtime as an argument, do not
refer to either of these fields.
In each function, there is one error case where apcm needs to be freed, and
a call to kfree is added.
The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression e,e1,e2,e3;
identifier f,free1,free2;
expression a;
@@
*e->f = a
... when != e->f = e1
when any
if (...) {
... when != free1(...,e,...)
when != e->f = e2
* kfree(a)
... when != free2(...,e,...)
when != e->f = e3
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-11-10 06:00:41 +08:00
|
|
|
if (!apcm->timer) {
|
|
|
|
|
kfree(apcm);
|
2009-06-05 22:11:07 +08:00
|
|
|
return -ENOMEM;
|
ALSA: sound/pci/ctxfi/ctpcm.c: Remove potential for use after free
In each function, the value apcm is stored in the private_data field of
runtime. At the same time the function ct_atc_pcm_free_substream is stored
in the private_free field of the same structure. ct_atc_pcm_free_substream
dereferences and ultimately frees the value in the private_data field. But
each function can exit in an error case with apcm having been freed, in
which case a subsequent call to the private_free function would perform a
dereference after free. On the other hand, if the private_free field is
not initialized, it is NULL, and not invoked (see snd_pcm_detach_substream
in sound/core/pcm.c). To avoid the introduction of a dangling pointer, the
initializations of the private_data and private_free fields are moved to
the end of the function, past any possible free of apcm. This is safe
because the previous calls to snd_pcm_hw_constraint_integer and
snd_pcm_hw_constraint_minmax, which take runtime as an argument, do not
refer to either of these fields.
In each function, there is one error case where apcm needs to be freed, and
a call to kfree is added.
The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression e,e1,e2,e3;
identifier f,free1,free2;
expression a;
@@
*e->f = a
... when != e->f = e1
when any
if (...) {
... when != free1(...,e,...)
when != e->f = e2
* kfree(a)
... when != free2(...,e,...)
when != e->f = e3
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-11-10 06:00:41 +08:00
|
|
|
}
|
|
|
|
|
runtime->private_data = apcm;
|
|
|
|
|
runtime->private_free = ct_atc_pcm_free_substream;
|
2009-06-05 22:11:07 +08:00
|
|
|
|
2009-05-14 14:05:58 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_capture_close(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
/* The ct_atc_pcm object will be freed by runtime->private_free */
|
|
|
|
|
/* TODO: Notify mixer inactive. */
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ct_pcm_capture_prepare(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
err = atc->pcm_capture_prepare(atc, apcm);
|
|
|
|
|
if (err < 0) {
|
2009-05-14 21:19:30 +08:00
|
|
|
printk(KERN_ERR "ctxfi: Preparing pcm capture failed!!!\n");
|
2009-05-14 14:05:58 +08:00
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
ct_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
|
|
|
{
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
|
|
|
atc->pcm_capture_start(atc, apcm);
|
|
|
|
|
break;
|
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
|
|
|
atc->pcm_capture_stop(atc, apcm);
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
atc->pcm_capture_stop(atc, apcm);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static snd_pcm_uframes_t
|
|
|
|
|
ct_pcm_capture_pointer(struct snd_pcm_substream *substream)
|
|
|
|
|
{
|
|
|
|
|
unsigned long position;
|
|
|
|
|
struct ct_atc *atc = snd_pcm_substream_chip(substream);
|
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
struct ct_atc_pcm *apcm = runtime->private_data;
|
|
|
|
|
|
|
|
|
|
/* Read out playback position */
|
|
|
|
|
position = atc->pcm_capture_position(atc, apcm);
|
|
|
|
|
position = bytes_to_frames(runtime, position);
|
2009-06-08 21:07:46 +08:00
|
|
|
if (position >= runtime->buffer_size)
|
|
|
|
|
position = 0;
|
2009-05-14 14:05:58 +08:00
|
|
|
return position;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* PCM operators for playback */
|
|
|
|
|
static struct snd_pcm_ops ct_pcm_playback_ops = {
|
|
|
|
|
.open = ct_pcm_playback_open,
|
|
|
|
|
.close = ct_pcm_playback_close,
|
|
|
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
|
|
|
.hw_params = ct_pcm_hw_params,
|
|
|
|
|
.hw_free = ct_pcm_hw_free,
|
|
|
|
|
.prepare = ct_pcm_playback_prepare,
|
|
|
|
|
.trigger = ct_pcm_playback_trigger,
|
|
|
|
|
.pointer = ct_pcm_playback_pointer,
|
2009-06-02 21:26:19 +08:00
|
|
|
.page = snd_pcm_sgbuf_ops_page,
|
2009-05-14 14:05:58 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* PCM operators for capture */
|
|
|
|
|
static struct snd_pcm_ops ct_pcm_capture_ops = {
|
|
|
|
|
.open = ct_pcm_capture_open,
|
|
|
|
|
.close = ct_pcm_capture_close,
|
|
|
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
|
|
|
.hw_params = ct_pcm_hw_params,
|
|
|
|
|
.hw_free = ct_pcm_hw_free,
|
|
|
|
|
.prepare = ct_pcm_capture_prepare,
|
|
|
|
|
.trigger = ct_pcm_capture_trigger,
|
|
|
|
|
.pointer = ct_pcm_capture_pointer,
|
2009-06-02 21:26:19 +08:00
|
|
|
.page = snd_pcm_sgbuf_ops_page,
|
2009-05-14 14:05:58 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* Create ALSA pcm device */
|
|
|
|
|
int ct_alsa_pcm_create(struct ct_atc *atc,
|
|
|
|
|
enum CTALSADEVS device,
|
|
|
|
|
const char *device_name)
|
|
|
|
|
{
|
|
|
|
|
struct snd_pcm *pcm;
|
|
|
|
|
int err;
|
|
|
|
|
int playback_count, capture_count;
|
|
|
|
|
|
2011-08-24 06:48:59 +08:00
|
|
|
playback_count = (IEC958 == device) ? 1 : 256;
|
2009-05-14 14:05:58 +08:00
|
|
|
capture_count = (FRONT == device) ? 1 : 0;
|
2009-06-02 20:27:56 +08:00
|
|
|
err = snd_pcm_new(atc->card, "ctxfi", device,
|
2009-05-14 14:05:58 +08:00
|
|
|
playback_count, capture_count, &pcm);
|
|
|
|
|
if (err < 0) {
|
2009-05-14 21:19:30 +08:00
|
|
|
printk(KERN_ERR "ctxfi: snd_pcm_new failed!! Err=%d\n", err);
|
2009-05-14 14:05:58 +08:00
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pcm->private_data = atc;
|
|
|
|
|
pcm->info_flags = 0;
|
|
|
|
|
pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
|
2009-06-02 20:27:56 +08:00
|
|
|
strlcpy(pcm->name, device_name, sizeof(pcm->name));
|
2009-05-14 14:05:58 +08:00
|
|
|
|
|
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &ct_pcm_playback_ops);
|
|
|
|
|
|
|
|
|
|
if (FRONT == device)
|
|
|
|
|
snd_pcm_set_ops(pcm,
|
|
|
|
|
SNDRV_PCM_STREAM_CAPTURE, &ct_pcm_capture_ops);
|
|
|
|
|
|
2009-06-02 21:26:19 +08:00
|
|
|
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
|
2009-05-14 14:05:58 +08:00
|
|
|
snd_dma_pci_data(atc->pci), 128*1024, 128*1024);
|
|
|
|
|
|
2009-06-22 20:52:34 +08:00
|
|
|
#ifdef CONFIG_PM
|
|
|
|
|
atc->pcms[device] = pcm;
|
|
|
|
|
#endif
|
|
|
|
|
|
2009-05-14 14:05:58 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|