From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/pci/pwrctrl/generic.c | 139 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 drivers/pci/pwrctrl/generic.c (limited to 'drivers/pci/pwrctrl/generic.c') diff --git a/drivers/pci/pwrctrl/generic.c b/drivers/pci/pwrctrl/generic.c new file mode 100644 index 000000000..a7e599d84 --- /dev/null +++ b/drivers/pci/pwrctrl/generic.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2024 Linaro Ltd. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct slot_pwrctrl { + struct pci_pwrctrl pwrctrl; + struct regulator_bulk_data *supplies; + int num_supplies; + struct clk *clk; + struct pwrseq_desc *pwrseq; +}; + +static int slot_pwrctrl_power_on(struct pci_pwrctrl *pwrctrl) +{ + struct slot_pwrctrl *slot = container_of(pwrctrl, + struct slot_pwrctrl, pwrctrl); + int ret; + + if (slot->pwrseq) { + pwrseq_power_on(slot->pwrseq); + return 0; + } + + ret = regulator_bulk_enable(slot->num_supplies, slot->supplies); + if (ret < 0) { + dev_err(slot->pwrctrl.dev, "Failed to enable slot regulators\n"); + return ret; + } + + return clk_prepare_enable(slot->clk); +} + +static int slot_pwrctrl_power_off(struct pci_pwrctrl *pwrctrl) +{ + struct slot_pwrctrl *slot = container_of(pwrctrl, + struct slot_pwrctrl, pwrctrl); + + if (slot->pwrseq) { + pwrseq_power_off(slot->pwrseq); + return 0; + } + + regulator_bulk_disable(slot->num_supplies, slot->supplies); + clk_disable_unprepare(slot->clk); + + return 0; +} + +static void devm_slot_pwrctrl_release(void *data) +{ + struct slot_pwrctrl *slot = data; + + regulator_bulk_free(slot->num_supplies, slot->supplies); +} + +static int slot_pwrctrl_probe(struct platform_device *pdev) +{ + struct slot_pwrctrl *slot; + struct device *dev = &pdev->dev; + int ret; + + slot = devm_kzalloc(dev, sizeof(*slot), GFP_KERNEL); + if (!slot) + return -ENOMEM; + + if (of_graph_is_present(dev_of_node(dev))) { + slot->pwrseq = devm_pwrseq_get(dev, "pcie"); + if (IS_ERR(slot->pwrseq)) + return dev_err_probe(dev, PTR_ERR(slot->pwrseq), + "Failed to get the power sequencer\n"); + + goto skip_resources; + } + + ret = of_regulator_bulk_get_all(dev, dev_of_node(dev), + &slot->supplies); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to get slot regulators\n"); + + slot->num_supplies = ret; + + slot->clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(slot->clk)) + return dev_err_probe(dev, PTR_ERR(slot->clk), + "Failed to enable slot clock\n"); + +skip_resources: + slot->pwrctrl.power_on = slot_pwrctrl_power_on; + slot->pwrctrl.power_off = slot_pwrctrl_power_off; + + ret = devm_add_action_or_reset(dev, devm_slot_pwrctrl_release, slot); + if (ret) + return ret; + + pci_pwrctrl_init(&slot->pwrctrl, dev); + + ret = devm_pci_pwrctrl_device_set_ready(dev, &slot->pwrctrl); + if (ret) + return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n"); + + return 0; +} + +static const struct of_device_id slot_pwrctrl_of_match[] = { + { + .compatible = "pciclass,0604", + }, + /* Renesas UPD720201/UPD720202 USB 3.0 xHCI Host Controller */ + { + .compatible = "pci1912,0014", + }, + { } +}; +MODULE_DEVICE_TABLE(of, slot_pwrctrl_of_match); + +static struct platform_driver slot_pwrctrl_driver = { + .driver = { + .name = "pci-pwrctrl-slot", + .of_match_table = slot_pwrctrl_of_match, + }, + .probe = slot_pwrctrl_probe, +}; +module_platform_driver(slot_pwrctrl_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Generic PCI Power Control driver for PCI Slots"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1