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tipc: Add missing spinlock in name table display code 

This patch ensures that the display code that traverses the
publication lists belonging to a name table entry take its
associated spinlock, to protect against a possible change to
one of its "head of list" pointers caused by a simultaneous
name table lookup operation by another thread of control.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2008-06-04 17:38:22 -07:00 committed by David S. Miller
parent 0f15d36453
commit 307fdf5e7d
1 changed files with 3 additions and 1 deletions
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4
net/tipc/name_table.c
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@ -74,7 +74,7 @@ struct sub_seq {
* @first_free: array index of first unused sub-sequence entry
* @ns_list: links to adjacent name sequences in hash chain
* @subscriptions: list of subscriptions for this 'type'
* @lock: spinlock controlling access to name sequence structure
* @lock: spinlock controlling access to publication lists of all sub-sequences
*/
struct name_seq {
@ -918,7 +918,9 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
tipc_printf(buf, "%s ", typearea);
spin_lock_bh(&seq->lock);
subseq_list(sseq, buf, depth, index);
spin_unlock_bh(&seq->lock);
sprintf(typearea, "%10s", " ");
}
}