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Amend r321884 to check the refcount and update the class with w_mtx held.

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Reviewed by:	jhb
X-MFC with:	r321884
This commit is contained in:
Mark Johnston 2017-08-01 23:14:38 +00:00
parent fad5dbf8d5
commit 526b5fe16c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=321896
1 changed files with 2 additions and 2 deletions
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4
sys/kern/subr_witness.c
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@ -1849,10 +1849,10 @@ enroll(const char *description, struct lock_class *lock_class)
return (w);
found:
w->w_refcount++;
mtx_unlock_spin(&w_mtx);
if (w->w_refcount == 1)
w->w_class = lock_class;
else if (lock_class != w->w_class)
mtx_unlock_spin(&w_mtx);
if (lock_class != w->w_class)
kassert_panic(
"lock (%s) %s does not match earlier (%s) lock",
description, lock_class->lc_name,