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upas/fs: make sure mbox is locked during msgdecref() in rclunk()

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This commit is contained in:
cinap_lenrek 2017-03-14 19:32:20 +01:00
parent d18440d992
commit 163dccbac0
1 changed files with 8 additions and 8 deletions
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16
sys/src/cmd/upas/fs/fs.c
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@ -1442,17 +1442,17 @@ sanefid(f);
/* coherence(); */ /* coherence(); */
f->fid = -1; f->fid = -1;
f->open = 0; f->open = 0;
if(f->mtop){
qlock(f->mb);
msgdecref(f->mb, f->mtop);
qunlock(f->mb);
}
if(f->m)
msgdecref(f->mb, gettopmsg(f->mb, f->m));
f->m = f->mtop = nil;
mb = f->mb; mb = f->mb;
if(mb != nil)
qlock(mb);
if(f->mtop)
msgdecref(mb, f->mtop);
if(f->m)
msgdecref(mb, gettopmsg(mb, f->m));
f->m = f->mtop = nil;
if(mb != nil){ if(mb != nil){
f->mb = nil; f->mb = nil;
qunlock(mb);
assert(mb->refs > 0); assert(mb->refs > 0);
qlock(&mbllock); qlock(&mbllock);
mboxdecref(mb); mboxdecref(mb);