From a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255 Mon Sep 17 00:00:00 2001 From: Jinke Han Date: Tue, 8 Sep 2026 15:37:42 +0800 Subject: x86/kprobes: Fix crash when probing CS CALL instructions When using eBPF to probe CS CALL instructions within a function, a crash can be triggered. The eBPF tool probes offset 257 of the __hrtimer_run_queues() function: <__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1) <__hrtimer_run_queues+254>: mov %r14,%rdi <__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12> <__hrtimer_run_queues+263>: mov %eax,%r12d <__hrtimer_run_queues+266>: xchg %ax,%ax <__hrtimer_run_queues+268>: mov %r13,%rdi Which triggers this crash: BUG: unable to handle page fault for address: 00000000000f41c9 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P RIP: 0010:__hrtimer_run_queues+0x106/0x230 Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is at the 6th byte of the above CS CALL instruction. Since the CS CALL instruction occupies 6 bytes, the exception occurred in the middle of that call instruction. The root cause is that when using eBPF tools to probe in the middle of a function, a kprobe with INT3 is used as the underlying implementation. During single-step emulation of the original CALL instruction, int3_emulate_call() assumes that the probed CALL instruction is 5 bytes long. However, the actual CS-prefixed CALL instruction occupies 6 bytes, so it constructs an incorrect exception return address. When the CPU returns from the kprobe handler, the next instruction to be executed is at the address of the last byte of that CS CALL instruction. Coincidentally, starting from that address, the CPU fetches and decodes a completely different instruction, which ultimately triggers a kernel crash. Fix the issue by using the actual instruction length obtained from the instruction decoder when constructing the exception return address, rather than relying on the hardcoded CALL_INSN_SIZE macro. [ mingo: Refined the changelog ] Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step") Suggested-by: Masami Hiramatsu (Google) Signed-off-by: Jinke Han Signed-off-by: Ingo Molnar Reviewed-by: Masami Hiramatsu (Google) Acked-by: Yafang Shao Acked-by: Borislav Petkov Cc: Peter Zijlstra Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000 --- sound/usb/clock.c | 694 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 694 insertions(+) create mode 100644 sound/usb/clock.c (limited to 'sound/usb/clock.c') diff --git a/sound/usb/clock.c b/sound/usb/clock.c new file mode 100644 index 000000000..34832183a --- /dev/null +++ b/sound/usb/clock.c @@ -0,0 +1,694 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Clock domain and sample rate management functions + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "usbaudio.h" +#include "card.h" +#include "helper.h" +#include "clock.h" +#include "quirks.h" + +union uac23_clock_source_desc { + struct uac_clock_source_descriptor v2; + struct uac3_clock_source_descriptor v3; +}; + +union uac23_clock_selector_desc { + struct uac_clock_selector_descriptor v2; + struct uac3_clock_selector_descriptor v3; +}; + +union uac23_clock_multiplier_desc { + struct uac_clock_multiplier_descriptor v2; + struct uac_clock_multiplier_descriptor v3; +}; + +/* check whether the descriptor bLength has the minimal length */ +#define DESC_LENGTH_CHECK(p, proto) \ + ((proto) == UAC_VERSION_3 ? \ + ((p)->v3.bLength >= sizeof((p)->v3)) : \ + ((p)->v2.bLength >= sizeof((p)->v2))) + +#define GET_VAL(p, proto, field) \ + ((proto) == UAC_VERSION_3 ? (p)->v3.field : (p)->v2.field) + +static void *find_uac_clock_desc(struct usb_host_interface *iface, int id, + bool (*validator)(void *, int, int), + u8 type, int proto) +{ + void *cs = NULL; + + while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen, + cs, type))) { + if (validator(cs, id, proto)) + return cs; + } + + return NULL; +} + +static bool validate_clock_source(void *p, int id, int proto) +{ + union uac23_clock_source_desc *cs = p; + + if (!DESC_LENGTH_CHECK(cs, proto)) + return false; + return GET_VAL(cs, proto, bClockID) == id; +} + +static bool validate_clock_selector(void *p, int id, int proto) +{ + union uac23_clock_selector_desc *cs = p; + + if (!DESC_LENGTH_CHECK(cs, proto)) + return false; + if (GET_VAL(cs, proto, bClockID) != id) + return false; + /* additional length check for baCSourceID array (in bNrInPins size) + * and two more fields (which sizes depend on the protocol) + */ + if (proto == UAC_VERSION_3) + return cs->v3.bLength >= sizeof(cs->v3) + cs->v3.bNrInPins + + 4 /* bmControls */ + 2 /* wCSelectorDescrStr */; + else + return cs->v2.bLength >= sizeof(cs->v2) + cs->v2.bNrInPins + + 1 /* bmControls */ + 1 /* iClockSelector */; +} + +static bool validate_clock_multiplier(void *p, int id, int proto) +{ + union uac23_clock_multiplier_desc *cs = p; + + if (!DESC_LENGTH_CHECK(cs, proto)) + return false; + return GET_VAL(cs, proto, bClockID) == id; +} + +#define DEFINE_FIND_HELPER(name, obj, validator, type2, type3) \ +static obj *name(struct snd_usb_audio *chip, int id, \ + const struct audioformat *fmt) \ +{ \ + struct usb_host_interface *ctrl_intf = \ + snd_usb_find_ctrl_interface(chip, fmt->iface); \ + return find_uac_clock_desc(ctrl_intf, id, validator, \ + fmt->protocol == UAC_VERSION_3 ? (type3) : (type2), \ + fmt->protocol); \ +} + +DEFINE_FIND_HELPER(snd_usb_find_clock_source, + union uac23_clock_source_desc, validate_clock_source, + UAC2_CLOCK_SOURCE, UAC3_CLOCK_SOURCE); +DEFINE_FIND_HELPER(snd_usb_find_clock_selector, + union uac23_clock_selector_desc, validate_clock_selector, + UAC2_CLOCK_SELECTOR, UAC3_CLOCK_SELECTOR); +DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier, + union uac23_clock_multiplier_desc, validate_clock_multiplier, + UAC2_CLOCK_MULTIPLIER, UAC3_CLOCK_MULTIPLIER); + +static int uac_clock_selector_get_val(struct snd_usb_audio *chip, + int selector_id, int iface_no) +{ + struct usb_host_interface *ctrl_intf; + unsigned char buf; + int ret; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); + ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), + UAC2_CS_CUR, + USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, + UAC2_CX_CLOCK_SELECTOR << 8, + snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), + &buf, sizeof(buf)); + + if (ret < 0) + return ret; + + return buf; +} + +static int uac_clock_selector_set_val(struct snd_usb_audio *chip, + int selector_id, unsigned char pin, int iface_no) +{ + struct usb_host_interface *ctrl_intf; + int ret; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); + ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), + UAC2_CS_CUR, + USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT, + UAC2_CX_CLOCK_SELECTOR << 8, + snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), + &pin, sizeof(pin)); + if (ret < 0) + return ret; + + if (ret != sizeof(pin)) { + usb_audio_err(chip, + "setting selector (id %d) unexpected length %d\n", + selector_id, ret); + return -EINVAL; + } + + ret = uac_clock_selector_get_val(chip, selector_id, iface_no); + if (ret < 0) + return ret; + + if (ret != pin) { + usb_audio_err(chip, + "setting selector (id %d) to %x failed (current: %d)\n", + selector_id, pin, ret); + return -EINVAL; + } + + return ret; +} + +static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, + const struct audioformat *fmt, + int source_id) +{ + bool ret = false; + int count; + unsigned char data; + struct usb_device *dev = chip->dev; + union uac23_clock_source_desc *cs_desc; + struct usb_host_interface *ctrl_intf; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); + cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); + if (!cs_desc) + return false; + + if (fmt->protocol == UAC_VERSION_2) { + /* + * Assume the clock is valid if clock source supports only one + * single sample rate, the terminal is connected directly to it + * (there is no clock selector) and clock type is internal. + * This is to deal with some Denon DJ controllers that always + * reports that clock is invalid. + */ + if (fmt->nr_rates == 1 && + (fmt->clock & 0xff) == cs_desc->v2.bClockID && + (cs_desc->v2.bmAttributes & 0x3) != + UAC_CLOCK_SOURCE_TYPE_EXT) + return true; + } + + /* + * Quirk for older MOTU AVB / hybrid interfaces + * + * These devices take more than 2 seconds to switch sample rate or + * clock source. During this period the clock validity request + * returns false, causing ALSA to fail prematurely. + * + * Affected models (all use vendor 0x07fd): + * - MicroBook IIc → 0x0004 + * - 1248, 624, 8A, UltraLite AVB, 8M, 16A, ... → 0x0005 + */ + if (chip->usb_id == USB_ID(0x07fd, 0x0004) || /* MicroBook IIc */ + chip->usb_id == USB_ID(0x07fd, 0x0005)) { /* 1248 / 624 / 8A / UltraLite AVB / ... */ + count = 0; + + while ((!ret) && (count < 50)) { + int err; + + msleep(100); + + err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, + USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, + UAC2_CS_CONTROL_CLOCK_VALID << 8, + snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), + &data, sizeof(data)); + if (err < 0) { + dev_warn(&dev->dev, + "%s(): cannot get clock validity for id %d\n", + __func__, source_id); + return false; + } + + ret = !!data; + count++; + } + } + + return ret; +} + +static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, + const struct audioformat *fmt, + int source_id) +{ + int err; + unsigned char data; + struct usb_device *dev = chip->dev; + u32 bmControls; + union uac23_clock_source_desc *cs_desc; + struct usb_host_interface *ctrl_intf; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); + cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); + if (!cs_desc) + return false; + + if (fmt->protocol == UAC_VERSION_3) + bmControls = le32_to_cpu(cs_desc->v3.bmControls); + else + bmControls = cs_desc->v2.bmControls; + + /* If a clock source can't tell us whether it's valid, we assume it is */ + if (!uac_v2v3_control_is_readable(bmControls, + UAC2_CS_CONTROL_CLOCK_VALID)) + return true; + + err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, + USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, + UAC2_CS_CONTROL_CLOCK_VALID << 8, + snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), + &data, sizeof(data)); + + if (err < 0) { + dev_warn(&dev->dev, + "%s(): cannot get clock validity for id %d\n", + __func__, source_id); + return false; + } + + if (data) + return true; + else + return uac_clock_source_is_valid_quirk(chip, fmt, source_id); +} + +static int __uac_clock_find_source(struct snd_usb_audio *chip, + const struct audioformat *fmt, int entity_id, + unsigned long *visited, bool validate) +{ + union uac23_clock_source_desc *source; + union uac23_clock_selector_desc *selector; + union uac23_clock_multiplier_desc *multiplier; + int ret, i, cur, err, pins, clock_id; + const u8 *sources; + int proto = fmt->protocol; + bool readable, writeable; + u32 bmControls; + + entity_id &= 0xff; + + if (test_and_set_bit(entity_id, visited)) { + usb_audio_warn(chip, + "%s(): recursive clock topology detected, id %d.\n", + __func__, entity_id); + return -EINVAL; + } + + /* first, see if the ID we're looking at is a clock source already */ + source = snd_usb_find_clock_source(chip, entity_id, fmt); + if (source) { + entity_id = GET_VAL(source, proto, bClockID); + if (validate && !uac_clock_source_is_valid(chip, fmt, + entity_id)) { + usb_audio_err(chip, + "clock source %d is not valid, cannot use\n", + entity_id); + return -ENXIO; + } + return entity_id; + } + + selector = snd_usb_find_clock_selector(chip, entity_id, fmt); + if (selector) { + pins = GET_VAL(selector, proto, bNrInPins); + clock_id = GET_VAL(selector, proto, bClockID); + sources = GET_VAL(selector, proto, baCSourceID); + cur = 0; + + if (proto == UAC_VERSION_3) + bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins)); + else + bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins); + + readable = uac_v2v3_control_is_readable(bmControls, + UAC2_CX_CLOCK_SELECTOR); + writeable = uac_v2v3_control_is_writeable(bmControls, + UAC2_CX_CLOCK_SELECTOR); + + if (pins == 1) { + ret = 1; + goto find_source; + } + + /* for now just warn about buggy device */ + if (!readable) + usb_audio_warn(chip, + "%s(): clock selector control is not readable, id %d\n", + __func__, clock_id); + + /* the entity ID we are looking at is a selector. + * find out what it currently selects */ + ret = uac_clock_selector_get_val(chip, clock_id, fmt->iface); + if (ret < 0) { + if (!chip->autoclock) + return ret; + goto find_others; + } + + /* Selector values are one-based */ + + if (ret > pins || ret < 1) { + usb_audio_err(chip, + "%s(): selector reported illegal value, id %d, ret %d\n", + __func__, clock_id, ret); + + if (!chip->autoclock) + return -EINVAL; + goto find_others; + } + + find_source: + cur = ret; + ret = __uac_clock_find_source(chip, fmt, + sources[ret - 1], + visited, validate); + if (ret > 0) { + /* Skip setting clock selector again for some devices */ + if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR || + !writeable) + return ret; + err = uac_clock_selector_set_val(chip, entity_id, cur, fmt->iface); + if (err < 0) { + if (pins == 1) { + usb_audio_dbg(chip, + "%s(): selector returned an error, " + "assuming a firmware bug, id %d, ret %d\n", + __func__, clock_id, err); + return ret; + } + return err; + } + } + + if (!validate || ret > 0 || !chip->autoclock) + return ret; + + find_others: + if (!writeable) + return -ENXIO; + + /* The current clock source is invalid, try others. */ + for (i = 1; i <= pins; i++) { + if (i == cur) + continue; + + ret = __uac_clock_find_source(chip, fmt, + sources[i - 1], + visited, true); + if (ret < 0) + continue; + + err = uac_clock_selector_set_val(chip, entity_id, i, fmt->iface); + if (err < 0) + continue; + + usb_audio_info(chip, + "found and selected valid clock source %d\n", + ret); + return ret; + } + + return -ENXIO; + } + + /* FIXME: multipliers only act as pass-thru element for now */ + multiplier = snd_usb_find_clock_multiplier(chip, entity_id, fmt); + if (multiplier) + return __uac_clock_find_source(chip, fmt, + GET_VAL(multiplier, proto, bCSourceID), + visited, validate); + + return -EINVAL; +} + +/* + * For all kinds of sample rate settings and other device queries, + * the clock source (end-leaf) must be used. However, clock selectors, + * clock multipliers and sample rate converters may be specified as + * clock source input to terminal. This functions walks the clock path + * to its end and tries to find the source. + * + * The 'visited' bitfield is used internally to detect recursive loops. + * + * Returns the clock source UnitID (>=0) on success, or an error. + */ +int snd_usb_clock_find_source(struct snd_usb_audio *chip, + const struct audioformat *fmt, bool validate) +{ + DECLARE_BITMAP(visited, 256); + memset(visited, 0, sizeof(visited)); + + switch (fmt->protocol) { + case UAC_VERSION_2: + case UAC_VERSION_3: + return __uac_clock_find_source(chip, fmt, fmt->clock, visited, + validate); + default: + return -EINVAL; + } +} + +static int set_sample_rate_v1(struct snd_usb_audio *chip, + const struct audioformat *fmt, int rate) +{ + struct usb_device *dev = chip->dev; + unsigned char data[3]; + int err, crate; + + /* if endpoint doesn't have sampling rate control, bail out */ + if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) + return 0; + + data[0] = rate; + data[1] = rate >> 8; + data[2] = rate >> 16; + err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, + USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, + UAC_EP_CS_ATTR_SAMPLE_RATE << 8, + fmt->endpoint, data, sizeof(data)); + if (err < 0) { + dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n", + fmt->iface, fmt->altsetting, rate, fmt->endpoint); + return err; + } + + /* Don't check the sample rate for devices which we know don't + * support reading */ + if (chip->quirk_flags & QUIRK_FLAG_GET_SAMPLE_RATE) + return 0; + /* the firmware is likely buggy, don't repeat to fail too many times */ + if (chip->sample_rate_read_error > 2) + return 0; + + err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR, + USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN, + UAC_EP_CS_ATTR_SAMPLE_RATE << 8, + fmt->endpoint, data, sizeof(data)); + if (err < 0) { + dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n", + fmt->iface, fmt->altsetting, fmt->endpoint); + chip->sample_rate_read_error++; + return 0; /* some devices don't support reading */ + } + + crate = data[0] | (data[1] << 8) | (data[2] << 16); + if (!crate) { + dev_info(&dev->dev, "failed to read current rate; disabling the check\n"); + chip->sample_rate_read_error = 3; /* three strikes, see above */ + return 0; + } + + if (crate != rate) { + dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate); + // runtime->rate = crate; + } + + return 0; +} + +static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface, + int altsetting, int clock) +{ + struct usb_device *dev = chip->dev; + __le32 data; + int err; + struct usb_host_interface *ctrl_intf; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, iface); + err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, + USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, + UAC2_CS_CONTROL_SAM_FREQ << 8, + snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), + &data, sizeof(data)); + if (err < 0) { + dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n", + iface, altsetting, err); + return 0; + } + + return le32_to_cpu(data); +} + +/* + * Try to set the given sample rate: + * + * Return 0 if the clock source is read-only, the actual rate on success, + * or a negative error code. + * + * This function gets called from format.c to validate each sample rate, too. + * Hence no message is shown upon error + */ +int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, + const struct audioformat *fmt, + int clock, int rate) +{ + bool writeable; + u32 bmControls; + __le32 data; + int err; + union uac23_clock_source_desc *cs_desc; + struct usb_host_interface *ctrl_intf; + + ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); + cs_desc = snd_usb_find_clock_source(chip, clock, fmt); + + if (!cs_desc) + return 0; + + if (fmt->protocol == UAC_VERSION_3) + bmControls = le32_to_cpu(cs_desc->v3.bmControls); + else + bmControls = cs_desc->v2.bmControls; + + writeable = uac_v2v3_control_is_writeable(bmControls, + UAC2_CS_CONTROL_SAM_FREQ); + if (!writeable) + return 0; + + data = cpu_to_le32(rate); + err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR, + USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, + UAC2_CS_CONTROL_SAM_FREQ << 8, + snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), + &data, sizeof(data)); + if (err < 0) + return err; + + return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); +} + +static int set_sample_rate_v2v3(struct snd_usb_audio *chip, + const struct audioformat *fmt, int rate) +{ + int cur_rate, prev_rate = 0; + int clock; + + /* First, try to find a valid clock. This may trigger + * automatic clock selection if the current clock is not + * valid. + */ + clock = snd_usb_clock_find_source(chip, fmt, true); + if (clock < 0) { + /* We did not find a valid clock, but that might be + * because the current sample rate does not match an + * external clock source. Try again without validation + * and we will do another validation after setting the + * rate. + */ + clock = snd_usb_clock_find_source(chip, fmt, false); + + /* Hardcoded sample rates */ + if (chip->quirk_flags & QUIRK_FLAG_IGNORE_CLOCK_SOURCE) + return 0; + + if (clock < 0) + return clock; + } + + if (!(chip->quirk_flags & QUIRK_FLAG_ALWAYS_SET_RATE)) { + prev_rate = get_sample_rate_v2v3(chip, fmt->iface, + fmt->altsetting, clock); + if (prev_rate == rate) + goto validation; + } + + cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate); + if (cur_rate < 0) { + usb_audio_err(chip, + "%d:%d: cannot set freq %d (v2/v3): err %d\n", + fmt->iface, fmt->altsetting, rate, cur_rate); + return cur_rate; + } + + if (!cur_rate) + cur_rate = prev_rate; + + if (cur_rate != rate) { + usb_audio_dbg(chip, + "%d:%d: freq mismatch: req %d, clock runs @%d\n", + fmt->iface, fmt->altsetting, rate, cur_rate); + /* continue processing */ + } + + /* FIXME - TEAC devices require the immediate interface setup */ + if (USB_ID_VENDOR(chip->usb_id) == 0x0644) { + bool cur_base_48k = (rate % 48000 == 0); + bool prev_base_48k = (prev_rate % 48000 == 0); + if (cur_base_48k != prev_base_48k) { + usb_set_interface(chip->dev, fmt->iface, fmt->altsetting); + if (chip->quirk_flags & QUIRK_FLAG_IFACE_DELAY) + msleep(50); + } + } + +validation: + /* validate clock after rate change */ + if (!uac_clock_source_is_valid(chip, fmt, clock)) + return -ENXIO; + return 0; +} + +int snd_usb_init_sample_rate(struct snd_usb_audio *chip, + const struct audioformat *fmt, int rate) +{ + usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n", + fmt->iface, fmt->altsetting, rate, fmt->clock); + + switch (fmt->protocol) { + case UAC_VERSION_1: + default: + return set_sample_rate_v1(chip, fmt, rate); + + case UAC_VERSION_3: + if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) { + if (rate != UAC3_BADD_SAMPLING_RATE) + return -ENXIO; + else + return 0; + } + fallthrough; + case UAC_VERSION_2: + return set_sample_rate_v2v3(chip, fmt, rate); + } +} + -- cgit v1.3.1