[ALSA] snd_usb_caiaq: fix potential lockups locking
This patch fixes potential lockups in snd_usb_caiaq by refining the locking mechanims and by using usb_kill_urb() in favor to usb_unlink_urb(). Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack
Takashi Iwai
Родитель
f57ab97e76
Коммит
8d048841e8
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* Copyright (c) 2006,2007 Daniel Mack, Karsten Wiese
|
||||
* Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
|
||||
*
|
||||
* 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
|
||||
|
|
@ -77,10 +77,15 @@ static void
|
|||
deactivate_substream(struct snd_usb_caiaqdev *dev,
|
||||
struct snd_pcm_substream *sub)
|
||||
{
|
||||
unsigned long flags;
|
||||
spin_lock_irqsave(&dev->spinlock, flags);
|
||||
|
||||
if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
dev->sub_playback[sub->number] = NULL;
|
||||
else
|
||||
dev->sub_capture[sub->number] = NULL;
|
||||
|
||||
spin_unlock_irqrestore(&dev->spinlock, flags);
|
||||
}
|
||||
|
||||
static int
|
||||
|
|
@ -97,13 +102,13 @@ static int stream_start(struct snd_usb_caiaqdev *dev)
|
|||
{
|
||||
int i, ret;
|
||||
|
||||
debug("stream_start(%p)\n", dev);
|
||||
spin_lock_irq(&dev->spinlock);
|
||||
if (dev->streaming) {
|
||||
spin_unlock_irq(&dev->spinlock);
|
||||
return -EINVAL;
|
||||
}
|
||||
debug("%s(%p)\n", __func__, dev);
|
||||
|
||||
if (dev->streaming)
|
||||
return -EINVAL;
|
||||
|
||||
memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
|
||||
memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
|
||||
dev->input_panic = 0;
|
||||
dev->output_panic = 0;
|
||||
dev->first_packet = 1;
|
||||
|
|
@ -112,37 +117,35 @@ static int stream_start(struct snd_usb_caiaqdev *dev)
|
|||
for (i = 0; i < N_URBS; i++) {
|
||||
ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
|
||||
if (ret) {
|
||||
log("unable to trigger initial read #%d! (ret = %d)\n",
|
||||
i, ret);
|
||||
log("unable to trigger read #%d! (ret %d)\n", i, ret);
|
||||
dev->streaming = 0;
|
||||
spin_unlock_irq(&dev->spinlock);
|
||||
return -EPIPE;
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock_irq(&dev->spinlock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void stream_stop(struct snd_usb_caiaqdev *dev)
|
||||
{
|
||||
int i;
|
||||
|
||||
debug("stream_stop(%p)\n", dev);
|
||||
|
||||
debug("%s(%p)\n", __func__, dev);
|
||||
if (!dev->streaming)
|
||||
return;
|
||||
|
||||
dev->streaming = 0;
|
||||
|
||||
for (i = 0; i < N_URBS; i++) {
|
||||
usb_unlink_urb(dev->data_urbs_in[i]);
|
||||
usb_unlink_urb(dev->data_urbs_out[i]);
|
||||
usb_kill_urb(dev->data_urbs_in[i]);
|
||||
usb_kill_urb(dev->data_urbs_out[i]);
|
||||
}
|
||||
}
|
||||
|
||||
static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
|
||||
debug("snd_usb_caiaq_substream_open(%p)\n", substream);
|
||||
debug("%s(%p)\n", __func__, substream);
|
||||
substream->runtime->hw = dev->pcm_info;
|
||||
snd_pcm_limit_hw_rates(substream->runtime);
|
||||
return 0;
|
||||
|
|
@ -152,7 +155,7 @@ static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
|
|||
{
|
||||
struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
|
||||
|
||||
debug("snd_usb_caiaq_substream_close(%p)\n", substream);
|
||||
debug("%s(%p)\n", __func__, substream);
|
||||
if (all_substreams_zero(dev->sub_playback) &&
|
||||
all_substreams_zero(dev->sub_capture)) {
|
||||
/* when the last client has stopped streaming,
|
||||
|
|
@ -160,24 +163,22 @@ static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
|
|||
stream_stop(dev);
|
||||
dev->pcm_info.rates = dev->samplerates;
|
||||
}
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
|
||||
struct snd_pcm_hw_params *hw_params)
|
||||
{
|
||||
debug("snd_usb_caiaq_pcm_hw_params(%p)\n", sub);
|
||||
debug("%s(%p)\n", __func__, sub);
|
||||
return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
|
||||
}
|
||||
|
||||
static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
|
||||
{
|
||||
struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
|
||||
debug("snd_usb_caiaq_pcm_hw_free(%p)\n", sub);
|
||||
spin_lock_irq(&dev->spinlock);
|
||||
debug("%s(%p)\n", __func__, sub);
|
||||
deactivate_substream(dev, sub);
|
||||
spin_unlock_irq(&dev->spinlock);
|
||||
return snd_pcm_lib_free_pages(sub);
|
||||
}
|
||||
|
||||
|
|
@ -196,7 +197,7 @@ static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
|
|||
struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
|
||||
debug("snd_usb_caiaq_pcm_prepare(%p)\n", substream);
|
||||
debug("%s(%p)\n", __func__, substream);
|
||||
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
|
||||
|
|
@ -247,15 +248,11 @@ static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
|
|||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||||
spin_lock(&dev->spinlock);
|
||||
activate_substream(dev, sub);
|
||||
spin_unlock(&dev->spinlock);
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
spin_lock(&dev->spinlock);
|
||||
deactivate_substream(dev, sub);
|
||||
spin_unlock(&dev->spinlock);
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
|
|
@ -328,8 +325,6 @@ static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
|
|||
if (all_substreams_zero(dev->sub_capture))
|
||||
return;
|
||||
|
||||
spin_lock(&dev->spinlock);
|
||||
|
||||
for (i = 0; i < iso->actual_length;) {
|
||||
for (stream = 0; stream < dev->n_streams; stream++, i++) {
|
||||
sub = dev->sub_capture[stream];
|
||||
|
|
@ -345,8 +340,6 @@ static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock(&dev->spinlock);
|
||||
}
|
||||
|
||||
static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
|
||||
|
|
@ -358,8 +351,6 @@ static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
|
|||
struct snd_pcm_substream *sub;
|
||||
int stream, i;
|
||||
|
||||
spin_lock(&dev->spinlock);
|
||||
|
||||
for (i = 0; i < iso->actual_length;) {
|
||||
if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
|
||||
for (stream = 0;
|
||||
|
|
@ -393,8 +384,6 @@ static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock(&dev->spinlock);
|
||||
}
|
||||
|
||||
static void read_in_urb(struct snd_usb_caiaqdev *dev,
|
||||
|
|
@ -418,8 +407,6 @@ static void read_in_urb(struct snd_usb_caiaqdev *dev,
|
|||
dev->input_panic ? "(input)" : "",
|
||||
dev->output_panic ? "(output)" : "");
|
||||
}
|
||||
|
||||
check_for_elapsed_periods(dev, dev->sub_capture);
|
||||
}
|
||||
|
||||
static void fill_out_urb(struct snd_usb_caiaqdev *dev,
|
||||
|
|
@ -429,8 +416,6 @@ static void fill_out_urb(struct snd_usb_caiaqdev *dev,
|
|||
unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
|
||||
struct snd_pcm_substream *sub;
|
||||
int stream, i;
|
||||
|
||||
spin_lock(&dev->spinlock);
|
||||
|
||||
for (i = 0; i < iso->length;) {
|
||||
for (stream = 0; stream < dev->n_streams; stream++, i++) {
|
||||
|
|
@ -456,9 +441,6 @@ static void fill_out_urb(struct snd_usb_caiaqdev *dev,
|
|||
for (stream = 0; stream < dev->n_streams; stream++, i++)
|
||||
usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
|
||||
}
|
||||
|
||||
spin_unlock(&dev->spinlock);
|
||||
check_for_elapsed_periods(dev, dev->sub_playback);
|
||||
}
|
||||
|
||||
static void read_completed(struct urb *urb)
|
||||
|
|
@ -472,6 +454,7 @@ static void read_completed(struct urb *urb)
|
|||
return;
|
||||
|
||||
dev = info->dev;
|
||||
|
||||
if (!dev->streaming)
|
||||
return;
|
||||
|
||||
|
|
@ -489,8 +472,12 @@ static void read_completed(struct urb *urb)
|
|||
out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
|
||||
|
||||
if (len > 0) {
|
||||
spin_lock(&dev->spinlock);
|
||||
fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
|
||||
read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
|
||||
spin_unlock(&dev->spinlock);
|
||||
check_for_elapsed_periods(dev, dev->sub_playback);
|
||||
check_for_elapsed_periods(dev, dev->sub_capture);
|
||||
send_it = 1;
|
||||
}
|
||||
|
||||
|
|
@ -696,7 +683,7 @@ int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
|
|||
|
||||
void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
|
||||
{
|
||||
debug("snd_usb_caiaq_audio_free (%p)\n", dev);
|
||||
debug("%s(%p)\n", __func__, dev);
|
||||
stream_stop(dev);
|
||||
free_urbs(dev->data_urbs_in);
|
||||
free_urbs(dev->data_urbs_out);
|
||||
|
|
|
|||
|
|
@ -42,7 +42,7 @@
|
|||
#endif
|
||||
|
||||
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
||||
MODULE_DESCRIPTION("caiaq USB audio, version 1.3.2");
|
||||
MODULE_DESCRIPTION("caiaq USB audio, version 1.3.4");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_SUPPORTED_DEVICE("{{Native Instruments, RigKontrol2},"
|
||||
"{Native Instruments, RigKontrol3},"
|
||||
|
|
@ -456,7 +456,7 @@ static void snd_disconnect(struct usb_interface *intf)
|
|||
struct snd_usb_caiaqdev *dev;
|
||||
struct snd_card *card = dev_get_drvdata(&intf->dev);
|
||||
|
||||
debug("snd_disconnect(%p)\n", intf);
|
||||
debug("%s(%p)\n", __func__, intf);
|
||||
|
||||
if (!card)
|
||||
return;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче