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Previously, the sequence number in the regulator event subsystem was updated without atomic operations, potentially leading to race conditions. This commit addresses the issue by making the sequence number atomic. Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com> Link: https://msgid.link/r/20240104141314.3337037-1-naresh.solanki@9elements.com Signed-off-by: Mark Brown <broonie@kernel.org>
92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Regulator event over netlink
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*
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* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
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*/
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#include <regulator/regulator.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <linux/atomic.h>
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#include "regnl.h"
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static atomic_t reg_event_seqnum = ATOMIC_INIT(0);
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static const struct genl_multicast_group reg_event_mcgrps[] = {
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{ .name = REG_GENL_MCAST_GROUP_NAME, },
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};
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static struct genl_family reg_event_genl_family __ro_after_init = {
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.module = THIS_MODULE,
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.name = REG_GENL_FAMILY_NAME,
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.version = REG_GENL_VERSION,
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.maxattr = REG_GENL_ATTR_MAX,
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.mcgrps = reg_event_mcgrps,
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.n_mcgrps = ARRAY_SIZE(reg_event_mcgrps),
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};
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int reg_generate_netlink_event(const char *reg_name, u64 event)
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{
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struct sk_buff *skb;
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struct nlattr *attr;
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struct reg_genl_event *edata;
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void *msg_header;
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int size;
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/* allocate memory */
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size = nla_total_size(sizeof(struct reg_genl_event)) +
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nla_total_size(0);
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skb = genlmsg_new(size, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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/* add the genetlink message header */
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msg_header = genlmsg_put(skb, 0, atomic_inc_return(®_event_seqnum),
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®_event_genl_family, 0, REG_GENL_CMD_EVENT);
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if (!msg_header) {
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nlmsg_free(skb);
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return -ENOMEM;
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}
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/* fill the data */
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attr = nla_reserve(skb, REG_GENL_ATTR_EVENT, sizeof(struct reg_genl_event));
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if (!attr) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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edata = nla_data(attr);
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memset(edata, 0, sizeof(struct reg_genl_event));
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strscpy(edata->reg_name, reg_name, sizeof(edata->reg_name));
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edata->event = event;
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/* send multicast genetlink message */
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genlmsg_end(skb, msg_header);
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size = genlmsg_multicast(®_event_genl_family, skb, 0, 0, GFP_ATOMIC);
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return size;
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}
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static int __init reg_event_genetlink_init(void)
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{
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return genl_register_family(®_event_genl_family);
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}
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static int __init reg_event_init(void)
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{
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int error;
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/* create genetlink for acpi event */
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error = reg_event_genetlink_init();
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if (error)
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pr_warn("Failed to create genetlink family for reg event\n");
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return 0;
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}
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fs_initcall(reg_event_init);
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