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tmpfs_free_tmp(): explicitly assert that tmp is locked

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Despite TMPFS_UNLOCK() is done in both paths later, unlocking not locked
mutex provides different failure mode.

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2021-01-05 20:53:45 +02:00
parent 42bebbda9e
commit 9f200bc47b
1 changed files with 2 additions and 1 deletions
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3
sys/fs/tmpfs/tmpfs_vfsops.c
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@ -544,8 +544,9 @@ tmpfs_unmount(struct mount *mp, int mntflags)
void
tmpfs_free_tmp(struct tmpfs_mount *tmp)
{
TMPFS_MP_ASSERT_LOCKED(tmp);
MPASS(tmp->tm_refcount > 0);
tmp->tm_refcount--;
if (tmp->tm_refcount > 0) {
TMPFS_UNLOCK(tmp);