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alistair23-linux/sound/usb/line6/capture.c
Kees Cook 6396bb2215 treewide: kzalloc() -> kcalloc() 
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

298 lines
7.5 KiB
C
Raw Blame History

/*
* Line 6 Linux USB driver
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*
*/
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "capture.h"
#include "driver.h"
#include "pcm.h"
/*
Find a free URB and submit it.
must be called in line6pcm->in.lock context
*/
static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
{
int index;
int i, urb_size;
int ret;
struct urb *urb_in;
index = find_first_zero_bit(&line6pcm->in.active_urbs,
line6pcm->line6->iso_buffers);
if (index < 0 || index >= line6pcm->line6->iso_buffers) {
dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
return -EINVAL;
}
urb_in = line6pcm->in.urbs[index];
urb_size = 0;
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
struct usb_iso_packet_descriptor *fin =
&urb_in->iso_frame_desc[i];
fin->offset = urb_size;
fin->length = line6pcm->max_packet_size_in;
urb_size += line6pcm->max_packet_size_in;
}
urb_in->transfer_buffer =
line6pcm->in.buffer +
index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in;
urb_in->transfer_buffer_length = urb_size;
urb_in->context = line6pcm;
ret = usb_submit_urb(urb_in, GFP_ATOMIC);
if (ret == 0)
set_bit(index, &line6pcm->in.active_urbs);
else
dev_err(line6pcm->line6->ifcdev,
"URB in #%d submission failed (%d)\n", index, ret);
return 0;
}
/*
Submit all currently available capture URBs.
must be called in line6pcm->in.lock context
*/
int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
{
int ret = 0, i;
for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
ret = submit_audio_in_urb(line6pcm);
if (ret < 0)
break;
}
return ret;
}
/*
Copy data into ALSA capture buffer.
*/
void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
{
struct snd_pcm_substream *substream =
get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
struct snd_pcm_runtime *runtime = substream->runtime;
const int bytes_per_frame =
line6pcm->properties->bytes_per_channel *
line6pcm->properties->capture_hw.channels_max;
int frames = fsize / bytes_per_frame;
if (runtime == NULL)
return;
if (line6pcm->in.pos_done + frames > runtime->buffer_size) {
/*
The transferred area goes over buffer boundary,
copy two separate chunks.
*/
int len;
len = runtime->buffer_size - line6pcm->in.pos_done;
if (len > 0) {
memcpy(runtime->dma_area +
line6pcm->in.pos_done * bytes_per_frame, fbuf,
len * bytes_per_frame);
memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
(frames - len) * bytes_per_frame);
} else {
/* this is somewhat paranoid */
dev_err(line6pcm->line6->ifcdev,
"driver bug: len = %d\n", len);
}
} else {
/* copy single chunk */
memcpy(runtime->dma_area +
line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize);
}
line6pcm->in.pos_done += frames;
if (line6pcm->in.pos_done >= runtime->buffer_size)
line6pcm->in.pos_done -= runtime->buffer_size;
}
void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
{
struct snd_pcm_substream *substream =
get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
line6pcm->in.bytes += length;
if (line6pcm->in.bytes >= line6pcm->in.period) {
line6pcm->in.bytes %= line6pcm->in.period;
spin_unlock(&line6pcm->in.lock);
snd_pcm_period_elapsed(substream);
spin_lock(&line6pcm->in.lock);
}
}
/*
* Callback for completed capture URB.
*/
static void audio_in_callback(struct urb *urb)
{
int i, index, length = 0, shutdown = 0;
unsigned long flags;
struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
line6pcm->in.last_frame = urb->start_frame;
/* find index of URB */
for (index = 0; index < line6pcm->line6->iso_buffers; ++index)
if (urb == line6pcm->in.urbs[index])
break;
spin_lock_irqsave(&line6pcm->in.lock, flags);
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
char *fbuf;
int fsize;
struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
if (fin->status == -EXDEV) {
shutdown = 1;
break;
}
fbuf = urb->transfer_buffer + fin->offset;
fsize = fin->actual_length;
if (fsize > line6pcm->max_packet_size_in) {
dev_err(line6pcm->line6->ifcdev,
"driver and/or device bug: packet too large (%d > %d)\n",
fsize, line6pcm->max_packet_size_in);
}
length += fsize;
BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1,
"The following code assumes LINE6_ISO_PACKETS == 1");
/* TODO:
* Also, if iso_buffers != 2, the prev frame is almost random at
* playback side.
* This needs to be redesigned. It should be "stable", but we may
* experience sync problems on such high-speed configs.
*/
line6pcm->prev_fbuf = fbuf;
line6pcm->prev_fsize = fsize /
(line6pcm->properties->bytes_per_channel *
line6pcm->properties->capture_hw.channels_max);
if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&
fsize > 0)
line6_capture_copy(line6pcm, fbuf, fsize);
}
clear_bit(index, &line6pcm->in.active_urbs);
if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
shutdown = 1;
if (!shutdown) {
submit_audio_in_urb(line6pcm);
if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
test_bit(LINE6_STREAM_PCM, &line6pcm->in.running))
line6_capture_check_period(line6pcm, length);
}
spin_unlock_irqrestore(&line6pcm->in.lock, flags);
}
/* open capture callback */
static int snd_line6_capture_open(struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
err = snd_pcm_hw_constraint_ratdens(runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&line6pcm->properties->rates);
if (err < 0)
return err;
line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false);
runtime->hw = line6pcm->properties->capture_hw;
return 0;
}
/* close capture callback */
static int snd_line6_capture_close(struct snd_pcm_substream *substream)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER);
return 0;
}
/* capture operators */
const struct snd_pcm_ops snd_line6_capture_ops = {
.open = snd_line6_capture_open,
.close = snd_line6_capture_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_line6_hw_params,
.hw_free = snd_line6_hw_free,
.prepare = snd_line6_prepare,
.trigger = snd_line6_trigger,
.pointer = snd_line6_pointer,
};
int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
struct usb_line6 *line6 = line6pcm->line6;
int i;
line6pcm->in.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *),
GFP_KERNEL);
if (line6pcm->in.urbs == NULL)
return -ENOMEM;
/* create audio URBs and fill in constant values: */
for (i = 0; i < line6->iso_buffers; ++i) {
struct urb *urb;
/* URB for audio in: */
urb = line6pcm->in.urbs[i] =
usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
if (urb == NULL)
return -ENOMEM;
urb->dev = line6->usbdev;
urb->pipe =
usb_rcvisocpipe(line6->usbdev,
line6->properties->ep_audio_r &
USB_ENDPOINT_NUMBER_MASK);
urb->transfer_flags = URB_ISO_ASAP;
urb->start_frame = -1;
urb->number_of_packets = LINE6_ISO_PACKETS;
urb->interval = LINE6_ISO_INTERVAL;
urb->error_count = 0;
urb->complete = audio_in_callback;
}
return 0;
}
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