From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- sound/usb/proc.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 236 insertions(+) create mode 100644 sound/usb/proc.c (limited to 'sound/usb/proc.c') diff --git a/sound/usb/proc.c b/sound/usb/proc.c new file mode 100644 index 000000000..f4b7a7ff3 --- /dev/null +++ b/sound/usb/proc.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + */ + +#include +#include + +#include +#include +#include + +#include "usbaudio.h" +#include "helper.h" +#include "card.h" +#include "endpoint.h" +#include "proc.h" + +/* convert our full speed USB rate into sampling rate in Hz */ +static inline unsigned get_full_speed_hz(unsigned int usb_rate) +{ + return (usb_rate * 125 + (1 << 12)) >> 13; +} + +/* convert our high speed USB rate into sampling rate in Hz */ +static inline unsigned get_high_speed_hz(unsigned int usb_rate) +{ + return (usb_rate * 125 + (1 << 9)) >> 10; +} + +/* + * common proc files to show the usb device info + */ +static void proc_audio_usbbus_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) +{ + struct snd_usb_audio *chip = entry->private_data; + if (!atomic_read(&chip->shutdown)) + snd_iprintf(buffer, "%03d/%03d\n", chip->dev->bus->busnum, chip->dev->devnum); +} + +static void proc_audio_usbid_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) +{ + struct snd_usb_audio *chip = entry->private_data; + if (!atomic_read(&chip->shutdown)) + snd_iprintf(buffer, "%04x:%04x\n", + USB_ID_VENDOR(chip->usb_id), + USB_ID_PRODUCT(chip->usb_id)); +} + +void snd_usb_audio_create_proc(struct snd_usb_audio *chip) +{ + snd_card_ro_proc_new(chip->card, "usbbus", chip, + proc_audio_usbbus_read); + snd_card_ro_proc_new(chip->card, "usbid", chip, + proc_audio_usbid_read); +} + +static const char * const channel_labels[] = { + [SNDRV_CHMAP_NA] = "N/A", + [SNDRV_CHMAP_MONO] = "MONO", + [SNDRV_CHMAP_FL] = "FL", + [SNDRV_CHMAP_FR] = "FR", + [SNDRV_CHMAP_FC] = "FC", + [SNDRV_CHMAP_LFE] = "LFE", + [SNDRV_CHMAP_RL] = "RL", + [SNDRV_CHMAP_RR] = "RR", + [SNDRV_CHMAP_FLC] = "FLC", + [SNDRV_CHMAP_FRC] = "FRC", + [SNDRV_CHMAP_RC] = "RC", + [SNDRV_CHMAP_SL] = "SL", + [SNDRV_CHMAP_SR] = "SR", + [SNDRV_CHMAP_TC] = "TC", + [SNDRV_CHMAP_TFL] = "TFL", + [SNDRV_CHMAP_TFC] = "TFC", + [SNDRV_CHMAP_TFR] = "TFR", + [SNDRV_CHMAP_TRL] = "TRL", + [SNDRV_CHMAP_TRC] = "TRC", + [SNDRV_CHMAP_TRR] = "TRR", + [SNDRV_CHMAP_TFLC] = "TFLC", + [SNDRV_CHMAP_TFRC] = "TFRC", + [SNDRV_CHMAP_LLFE] = "LLFE", + [SNDRV_CHMAP_RLFE] = "RLFE", + [SNDRV_CHMAP_TSL] = "TSL", + [SNDRV_CHMAP_TSR] = "TSR", + [SNDRV_CHMAP_BC] = "BC", + [SNDRV_CHMAP_RLC] = "RLC", + [SNDRV_CHMAP_RRC] = "RRC", +}; + +/* + * proc interface for list the supported pcm formats + */ +static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer) +{ + struct audioformat *fp; + static const char * const sync_types[4] = { + "NONE", "ASYNC", "ADAPTIVE", "SYNC" + }; + + list_for_each_entry(fp, &subs->fmt_list, list) { + snd_pcm_format_t fmt; + + snd_iprintf(buffer, " Interface %d\n", fp->iface); + snd_iprintf(buffer, " Altset %d\n", fp->altsetting); + snd_iprintf(buffer, " Format:"); + pcm_for_each_format(fmt) + if (fp->formats & pcm_format_to_bits(fmt)) + snd_iprintf(buffer, " %s", + snd_pcm_format_name(fmt)); + snd_iprintf(buffer, "\n"); + snd_iprintf(buffer, " Channels: %d\n", fp->channels); + snd_iprintf(buffer, " Endpoint: 0x%02x (%d %s) (%s)\n", + fp->endpoint, + fp->endpoint & USB_ENDPOINT_NUMBER_MASK, + fp->endpoint & USB_DIR_IN ? "IN" : "OUT", + sync_types[(fp->ep_attr & USB_ENDPOINT_SYNCTYPE) >> 2]); + if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) { + snd_iprintf(buffer, " Rates: %d - %d (continuous)\n", + fp->rate_min, fp->rate_max); + } else { + unsigned int i; + snd_iprintf(buffer, " Rates: "); + for (i = 0; i < fp->nr_rates; i++) { + if (i > 0) + snd_iprintf(buffer, ", "); + snd_iprintf(buffer, "%d", fp->rate_table[i]); + } + snd_iprintf(buffer, "\n"); + } + if (subs->speed != USB_SPEED_FULL) + snd_iprintf(buffer, " Data packet interval: %d us\n", + 125 * (1 << fp->datainterval)); + snd_iprintf(buffer, " Bits: %d\n", fp->fmt_bits); + + if (fp->dsd_raw) + snd_iprintf(buffer, " DSD raw: DOP=%d, bitrev=%d\n", + fp->dsd_dop, fp->dsd_bitrev); + + if (fp->chmap) { + const struct snd_pcm_chmap_elem *map = fp->chmap; + int c; + + snd_iprintf(buffer, " Channel map:"); + for (c = 0; c < map->channels; c++) { + if (map->map[c] >= ARRAY_SIZE(channel_labels) || + !channel_labels[map->map[c]]) + snd_iprintf(buffer, " --"); + else + snd_iprintf(buffer, " %s", + channel_labels[map->map[c]]); + } + snd_iprintf(buffer, "\n"); + } + + if (fp->sync_ep) { + snd_iprintf(buffer, " Sync Endpoint: 0x%02x (%d %s)\n", + fp->sync_ep, + fp->sync_ep & USB_ENDPOINT_NUMBER_MASK, + fp->sync_ep & USB_DIR_IN ? "IN" : "OUT"); + snd_iprintf(buffer, " Sync EP Interface: %d\n", + fp->sync_iface); + snd_iprintf(buffer, " Sync EP Altset: %d\n", + fp->sync_altsetting); + snd_iprintf(buffer, " Implicit Feedback Mode: %s\n", + fp->implicit_fb ? "Yes" : "No"); + } + + // snd_iprintf(buffer, " Max Packet Size = %d\n", fp->maxpacksize); + // snd_iprintf(buffer, " EP Attribute = %#x\n", fp->attributes); + } +} + +static void proc_dump_ep_status(struct snd_usb_substream *subs, + struct snd_usb_endpoint *data_ep, + struct snd_usb_endpoint *sync_ep, + struct snd_info_buffer *buffer) +{ + if (!data_ep) + return; + snd_iprintf(buffer, " Packet Size = %d\n", data_ep->curpacksize); + snd_iprintf(buffer, " Momentary freq = %u Hz (%#x.%04x)\n", + subs->speed == USB_SPEED_FULL + ? get_full_speed_hz(data_ep->freqm) + : get_high_speed_hz(data_ep->freqm), + data_ep->freqm >> 16, data_ep->freqm & 0xffff); + if (sync_ep && data_ep->freqshift != INT_MIN) { + int res = 16 - data_ep->freqshift; + snd_iprintf(buffer, " Feedback Format = %d.%d\n", + (sync_ep->syncmaxsize > 3 ? 32 : 24) - res, res); + } +} + +static void proc_dump_substream_status(struct snd_usb_audio *chip, + struct snd_usb_substream *subs, + struct snd_info_buffer *buffer) +{ + guard(mutex)(&chip->mutex); + if (subs->running) { + snd_iprintf(buffer, " Status: Running\n"); + if (subs->cur_audiofmt) { + snd_iprintf(buffer, " Interface = %d\n", subs->cur_audiofmt->iface); + snd_iprintf(buffer, " Altset = %d\n", subs->cur_audiofmt->altsetting); + } + proc_dump_ep_status(subs, subs->data_endpoint, subs->sync_endpoint, buffer); + } else { + snd_iprintf(buffer, " Status: Stop\n"); + } +} + +static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) +{ + struct snd_usb_stream *stream = entry->private_data; + struct snd_usb_audio *chip = stream->chip; + + snd_iprintf(buffer, "%s : %s\n", chip->card->longname, stream->pcm->name); + + if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) { + snd_iprintf(buffer, "\nPlayback:\n"); + proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer); + proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer); + } + if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) { + snd_iprintf(buffer, "\nCapture:\n"); + proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer); + proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer); + } +} + +void snd_usb_proc_pcm_format_add(struct snd_usb_stream *stream) +{ + char name[32]; + struct snd_card *card = stream->chip->card; + + scnprintf(name, sizeof(name), "stream%d", stream->pcm_index); + snd_card_ro_proc_new(card, name, stream, proc_pcm_format_read); +} + -- cgit v1.3.1