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uprobes: _unregister() should always do register_for_each_vma(false)

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uprobe_unregister() removes the breakpoints only if the last consumer
goes away. To support the filtering it should do this every time, we
want to remove the breakpoints which nobody else want to keep.

Note: given that filter_chain() is not actually implemented, this patch
itself doesn't change the behaviour yet, register_for_each_vma(false)
is a heavy "nop" unless there are no more consumers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-11-23 19:43:50 +01:00
parent 63633cbf82
commit 04aab9b200
1 changed files with 14 additions and 14 deletions
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28
kernel/events/uprobes.c
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@ -825,12 +825,20 @@ static int __uprobe_register(struct uprobe *uprobe)
return register_for_each_vma(uprobe, true);
}
static void __uprobe_unregister(struct uprobe *uprobe)
static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
{
if (!register_for_each_vma(uprobe, false))
delete_uprobe(uprobe);
int err;
/* TODO : cant unregister? schedule a worker thread */
if (!consumer_del(uprobe, uc)) /* WARN? */
return;
err = register_for_each_vma(uprobe, false);
if (!uprobe->consumers) {
clear_bit(UPROBE_RUN_HANDLER, &uprobe->flags);
/* TODO : cant unregister? schedule a worker thread */
if (!err)
delete_uprobe(uprobe);
}
}
/*
@ -868,8 +876,7 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
} else if (!consumer_add(uprobe, uc)) {
ret = __uprobe_register(uprobe);
if (ret) {
uprobe->consumers = NULL;
__uprobe_unregister(uprobe);
__uprobe_unregister(uprobe, uc);
} else {
set_bit(UPROBE_RUN_HANDLER, &uprobe->flags);
}
@ -897,14 +904,7 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
return;
mutex_lock(uprobes_hash(inode));
if (consumer_del(uprobe, uc)) {
if (!uprobe->consumers) {
__uprobe_unregister(uprobe);
clear_bit(UPROBE_RUN_HANDLER, &uprobe->flags);
}
}
__uprobe_unregister(uprobe, uc);
mutex_unlock(uprobes_hash(inode));
put_uprobe(uprobe);
}