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timens: Use mutex guard in proc_timens_set_offset()

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Simplify the logic in proc_timens_set_offset() by converting the mutex
usage to a guard().

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260330-timens-cleanup-v1-3-936e91c9dd30@linutronix.de
This commit is contained in:
Thomas Weißschuh
2026-03-30 09:07:57 +02:00
committed by Thomas Gleixner
parent 3fa3aeb4a5
commit 6d89dc8b1c
1 changed files with 5 additions and 11 deletions
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16
kernel/time/namespace.c
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@@ -270,7 +270,7 @@ int proc_timens_set_offset(struct file *file, struct task_struct *p,
struct time_namespace *time_ns __free(time_ns) = NULL;
struct ns_common *ns = timens_for_children_get(p);
struct timespec64 tp;
int i, err;
int i;
if (!ns)
return -ESRCH;
@@ -307,13 +307,10 @@ int proc_timens_set_offset(struct file *file, struct task_struct *p,
return -ERANGE;
}
mutex_lock(&timens_offset_lock);
if (time_ns->frozen_offsets) {
err = -EACCES;
goto out_unlock;
}
guard(mutex)(&timens_offset_lock);
if (time_ns->frozen_offsets)
return -EACCES;
err = 0;
/* Don't report errors after this line */
for (i = 0; i < noffsets; i++) {
struct proc_timens_offset *off = &offsets[i];
@@ -331,10 +328,7 @@ int proc_timens_set_offset(struct file *file, struct task_struct *p,
*offset = off->val;
}
out_unlock:
mutex_unlock(&timens_offset_lock);
return err;
return 0;
}
const struct proc_ns_operations timens_operations = {