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| author | Takashi Iwai <tiwai@suse.de> | 2024-08-09 14:25:16 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2024-08-09 14:25:24 +0200 |
| commit | 4004f3029e1f612903f03df497153c90a2752130 (patch) | |
| tree | 236b0dc4d6ed7421aba5bfd426ac936a0d99721f /kernel/ksysfs.c | |
| parent | f6c9a097b55e1955e3dd35f1de4828d3ed67534c (diff) | |
| parent | 9cacb32a0ba691c2859a20bd5e30b71cc592fad2 (diff) | |
Merge branch 'topic/control-lookup-rwlock' into for-next
Pull control lookup optimization changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'kernel/ksysfs.c')
| -rw-r--r-- | kernel/ksysfs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 07fb5987b42b..1bab21b4718f 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -92,7 +92,14 @@ static ssize_t profiling_store(struct kobject *kobj, const char *buf, size_t count) { int ret; + static DEFINE_MUTEX(lock); + /* + * We need serialization, for profile_setup() initializes prof_on + * value and profile_init() must not reallocate prof_buffer after + * once allocated. + */ + guard(mutex)(&lock); if (prof_on) return -EEXIST; /* |