From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- sound/soc/codecs/cq93vc.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 sound/soc/codecs/cq93vc.c (limited to 'sound/soc/codecs/cq93vc.c') diff --git a/sound/soc/codecs/cq93vc.c b/sound/soc/codecs/cq93vc.c new file mode 100644 index 000000000..32b6a417d --- /dev/null +++ b/sound/soc/codecs/cq93vc.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ALSA SoC CQ0093 Voice Codec Driver for DaVinci platforms + * + * Copyright (C) 2010 Texas Instruments, Inc + * + * Author: Miguel Aguilar + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +static const struct snd_kcontrol_new cq93vc_snd_controls[] = { + SOC_SINGLE("PGA Capture Volume", DAVINCI_VC_REG05, 0, 0x03, 0), + SOC_SINGLE("Mono DAC Playback Volume", DAVINCI_VC_REG09, 0, 0x3f, 0), +}; + +static int cq93vc_mute(struct snd_soc_dai *dai, int mute, int direction) +{ + struct snd_soc_component *component = dai->component; + u8 reg; + + if (mute) + reg = DAVINCI_VC_REG09_MUTE; + else + reg = 0; + + snd_soc_component_update_bits(component, DAVINCI_VC_REG09, DAVINCI_VC_REG09_MUTE, + reg); + + return 0; +} + +static int cq93vc_set_dai_sysclk(struct snd_soc_dai *codec_dai, + int clk_id, unsigned int freq, int dir) +{ + switch (freq) { + case 22579200: + case 27000000: + case 33868800: + return 0; + } + + return -EINVAL; +} + +static int cq93vc_set_bias_level(struct snd_soc_component *component, + enum snd_soc_bias_level level) +{ + switch (level) { + case SND_SOC_BIAS_ON: + snd_soc_component_write(component, DAVINCI_VC_REG12, + DAVINCI_VC_REG12_POWER_ALL_ON); + break; + case SND_SOC_BIAS_PREPARE: + break; + case SND_SOC_BIAS_STANDBY: + snd_soc_component_write(component, DAVINCI_VC_REG12, + DAVINCI_VC_REG12_POWER_ALL_OFF); + break; + case SND_SOC_BIAS_OFF: + /* force all power off */ + snd_soc_component_write(component, DAVINCI_VC_REG12, + DAVINCI_VC_REG12_POWER_ALL_OFF); + break; + } + + return 0; +} + +#define CQ93VC_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000) +#define CQ93VC_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE) + +static const struct snd_soc_dai_ops cq93vc_dai_ops = { + .mute_stream = cq93vc_mute, + .set_sysclk = cq93vc_set_dai_sysclk, + .no_capture_mute = 1, +}; + +static struct snd_soc_dai_driver cq93vc_dai = { + .name = "cq93vc-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 1, + .channels_max = 2, + .rates = CQ93VC_RATES, + .formats = CQ93VC_FORMATS,}, + .capture = { + .stream_name = "Capture", + .channels_min = 1, + .channels_max = 2, + .rates = CQ93VC_RATES, + .formats = CQ93VC_FORMATS,}, + .ops = &cq93vc_dai_ops, +}; + +static int cq93vc_probe(struct snd_soc_component *component) +{ + struct davinci_vc *davinci_vc = component->dev->platform_data; + + snd_soc_component_init_regmap(component, davinci_vc->regmap); + + return 0; +} + +static const struct snd_soc_component_driver soc_component_dev_cq93vc = { + .set_bias_level = cq93vc_set_bias_level, + .probe = cq93vc_probe, + .controls = cq93vc_snd_controls, + .num_controls = ARRAY_SIZE(cq93vc_snd_controls), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static int cq93vc_platform_probe(struct platform_device *pdev) +{ + return devm_snd_soc_register_component(&pdev->dev, + &soc_component_dev_cq93vc, &cq93vc_dai, 1); +} + +static struct platform_driver cq93vc_codec_driver = { + .driver = { + .name = "cq93vc-codec", + }, + + .probe = cq93vc_platform_probe, +}; + +module_platform_driver(cq93vc_codec_driver); + +MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC CQ0093 Voice Codec Driver"); +MODULE_AUTHOR("Miguel Aguilar"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1