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![QintaoShen](/assets/img/avatar_default.png)
The allocation funciton devm_kcalloc may fail and return a null pointer, which would cause a null-pointer dereference later. It might be better to check it and directly return -ENOMEM just like the usage of devm_kcalloc in previous code. Signed-off-by: QintaoShen <unSimple1993@163.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/1648107843-29077-1-git-send-email-unSimple1993@163.com
208 lines
5.5 KiB
C
208 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI SCI Generic Power Domain Driver
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*
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* Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
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* J Keerthy <j-keerthy@ti.com>
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* Dave Gerlach <d-gerlach@ti.com>
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/slab.h>
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#include <linux/soc/ti/ti_sci_protocol.h>
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#include <dt-bindings/soc/ti,sci_pm_domain.h>
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/**
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* struct ti_sci_genpd_provider: holds common TI SCI genpd provider data
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* @ti_sci: handle to TI SCI protocol driver that provides ops to
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* communicate with system control processor.
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* @dev: pointer to dev for the driver for devm allocs
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* @pd_list: list of all the power domains on the device
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* @data: onecell data for genpd core
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*/
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struct ti_sci_genpd_provider {
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const struct ti_sci_handle *ti_sci;
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struct device *dev;
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struct list_head pd_list;
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struct genpd_onecell_data data;
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};
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/**
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* struct ti_sci_pm_domain: TI specific data needed for power domain
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* @idx: index of the device that identifies it with the system
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* control processor.
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* @exclusive: Permissions for exclusive request or shared request of the
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* device.
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* @pd: generic_pm_domain for use with the genpd framework
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* @node: link for the genpd list
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* @parent: link to the parent TI SCI genpd provider
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*/
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struct ti_sci_pm_domain {
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int idx;
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u8 exclusive;
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struct generic_pm_domain pd;
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struct list_head node;
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struct ti_sci_genpd_provider *parent;
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};
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#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)
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/*
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* ti_sci_pd_power_off(): genpd power down hook
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* @domain: pointer to the powerdomain to power off
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*/
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static int ti_sci_pd_power_off(struct generic_pm_domain *domain)
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{
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struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
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const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;
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return ti_sci->ops.dev_ops.put_device(ti_sci, pd->idx);
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}
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/*
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* ti_sci_pd_power_on(): genpd power up hook
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* @domain: pointer to the powerdomain to power on
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*/
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static int ti_sci_pd_power_on(struct generic_pm_domain *domain)
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{
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struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
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const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;
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if (pd->exclusive)
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return ti_sci->ops.dev_ops.get_device_exclusive(ti_sci,
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pd->idx);
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else
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return ti_sci->ops.dev_ops.get_device(ti_sci, pd->idx);
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}
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/*
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* ti_sci_pd_xlate(): translation service for TI SCI genpds
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* @genpdspec: DT identification data for the genpd
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* @data: genpd core data for all the powerdomains on the device
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*/
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static struct generic_pm_domain *ti_sci_pd_xlate(
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struct of_phandle_args *genpdspec,
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void *data)
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{
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struct genpd_onecell_data *genpd_data = data;
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unsigned int idx = genpdspec->args[0];
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if (genpdspec->args_count != 1 && genpdspec->args_count != 2)
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return ERR_PTR(-EINVAL);
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if (idx >= genpd_data->num_domains) {
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pr_err("%s: invalid domain index %u\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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if (!genpd_data->domains[idx])
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return ERR_PTR(-ENOENT);
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genpd_to_ti_sci_pd(genpd_data->domains[idx])->exclusive =
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genpdspec->args[1];
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return genpd_data->domains[idx];
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}
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static const struct of_device_id ti_sci_pm_domain_matches[] = {
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{ .compatible = "ti,sci-pm-domain", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);
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static int ti_sci_pm_domain_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ti_sci_genpd_provider *pd_provider;
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struct ti_sci_pm_domain *pd;
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struct device_node *np = NULL;
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struct of_phandle_args args;
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int ret;
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u32 max_id = 0;
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int index;
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pd_provider = devm_kzalloc(dev, sizeof(*pd_provider), GFP_KERNEL);
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if (!pd_provider)
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return -ENOMEM;
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pd_provider->ti_sci = devm_ti_sci_get_handle(dev);
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if (IS_ERR(pd_provider->ti_sci))
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return PTR_ERR(pd_provider->ti_sci);
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pd_provider->dev = dev;
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INIT_LIST_HEAD(&pd_provider->pd_list);
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/* Find highest device ID used for power domains */
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while (1) {
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np = of_find_node_with_property(np, "power-domains");
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if (!np)
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break;
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index = 0;
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while (1) {
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ret = of_parse_phandle_with_args(np, "power-domains",
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"#power-domain-cells",
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index, &args);
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if (ret)
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break;
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if (args.args_count >= 1 && args.np == dev->of_node) {
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if (args.args[0] > max_id)
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max_id = args.args[0];
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return -ENOMEM;
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pd->pd.name = devm_kasprintf(dev, GFP_KERNEL,
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"pd:%d",
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args.args[0]);
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if (!pd->pd.name)
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return -ENOMEM;
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pd->pd.power_off = ti_sci_pd_power_off;
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pd->pd.power_on = ti_sci_pd_power_on;
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pd->idx = args.args[0];
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pd->parent = pd_provider;
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pm_genpd_init(&pd->pd, NULL, true);
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list_add(&pd->node, &pd_provider->pd_list);
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}
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index++;
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}
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}
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pd_provider->data.domains =
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devm_kcalloc(dev, max_id + 1,
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sizeof(*pd_provider->data.domains),
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GFP_KERNEL);
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if (!pd_provider->data.domains)
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return -ENOMEM;
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pd_provider->data.num_domains = max_id + 1;
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pd_provider->data.xlate = ti_sci_pd_xlate;
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list_for_each_entry(pd, &pd_provider->pd_list, node)
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pd_provider->data.domains[pd->idx] = &pd->pd;
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return of_genpd_add_provider_onecell(dev->of_node, &pd_provider->data);
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}
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static struct platform_driver ti_sci_pm_domains_driver = {
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.probe = ti_sci_pm_domain_probe,
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.driver = {
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.name = "ti_sci_pm_domains",
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.of_match_table = ti_sci_pm_domain_matches,
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},
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};
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module_platform_driver(ti_sci_pm_domains_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");
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MODULE_AUTHOR("Dave Gerlach");
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