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/ssm2305.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 sound/soc/codecs/ssm2305.c (limited to 'sound/soc/codecs/ssm2305.c') diff --git a/sound/soc/codecs/ssm2305.c b/sound/soc/codecs/ssm2305.c new file mode 100644 index 000000000..1d022643c --- /dev/null +++ b/sound/soc/codecs/ssm2305.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Analog Devices SSM2305 Amplifier Driver +// +// Copyright (C) 2018 Pengutronix, Marco Felsch +// + +#include +#include +#include + +#define DRV_NAME "ssm2305" + +struct ssm2305 { + /* shutdown gpio */ + struct gpio_desc *gpiod_shutdown; +}; + +static int ssm2305_power_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kctrl, int event) +{ + struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm); + struct ssm2305 *data = snd_soc_component_get_drvdata(c); + + gpiod_set_value_cansleep(data->gpiod_shutdown, + SND_SOC_DAPM_EVENT_ON(event)); + + return 0; +} + +static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = { + /* Stereo input/output */ + SND_SOC_DAPM_INPUT("L_IN"), + SND_SOC_DAPM_INPUT("R_IN"), + SND_SOC_DAPM_OUTPUT("L_OUT"), + SND_SOC_DAPM_OUTPUT("R_OUT"), + + SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event, + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), +}; + +static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = { + { "L_OUT", NULL, "L_IN" }, + { "R_OUT", NULL, "R_IN" }, + { "L_IN", NULL, "Power" }, + { "R_IN", NULL, "Power" }, +}; + +static const struct snd_soc_component_driver ssm2305_component_driver = { + .dapm_widgets = ssm2305_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets), + .dapm_routes = ssm2305_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes), +}; + +static int ssm2305_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ssm2305 *priv; + + /* Allocate the private data */ + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + /* Get shutdown gpio */ + priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", + GPIOD_OUT_LOW); + if (IS_ERR(priv->gpiod_shutdown)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown), + "Failed to get 'shutdown' gpio\n"); + + return devm_snd_soc_register_component(dev, &ssm2305_component_driver, + NULL, 0); +} + +#ifdef CONFIG_OF +static const struct of_device_id ssm2305_of_match[] = { + { .compatible = "adi,ssm2305", }, + { } +}; +MODULE_DEVICE_TABLE(of, ssm2305_of_match); +#endif + +static struct platform_driver ssm2305_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = of_match_ptr(ssm2305_of_match), + }, + .probe = ssm2305_probe, +}; + +module_platform_driver(ssm2305_driver); + +MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver"); +MODULE_AUTHOR("Marco Felsch "); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1