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regulator: event: Ensure atomicity for sequence number

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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>
This commit is contained in:
Naresh Solanki 2024-01-04 19:43:13 +05:30 committed by Mark Brown
parent 51088e5cc2
commit 1cadc04c1a
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 4 deletions
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8
drivers/regulator/event.c
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@ -8,10 +8,11 @@
#include <regulator/regulator.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <linux/atomic.h>
#include "regnl.h"
static unsigned int reg_event_seqnum;
static atomic_t reg_event_seqnum = ATOMIC_INIT(0);
static const struct genl_multicast_group reg_event_mcgrps[] = {
{ .name = REG_GENL_MCAST_GROUP_NAME, },
@ -43,9 +44,8 @@ int reg_generate_netlink_event(const char *reg_name, u64 event)
return -ENOMEM;
/* add the genetlink message header */
msg_header = genlmsg_put(skb, 0, reg_event_seqnum++,
&reg_event_genl_family, 0,
REG_GENL_CMD_EVENT);
msg_header = genlmsg_put(skb, 0, atomic_inc_return(&reg_event_seqnum),
&reg_event_genl_family, 0, REG_GENL_CMD_EVENT);
if (!msg_header) {
nlmsg_free(skb);
return -ENOMEM;