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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>
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1 changed files with 3 additions and 1 deletions
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@ -74,7 +74,7 @@ struct sub_seq {
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* @first_free: array index of first unused sub-sequence entry
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* @ns_list: links to adjacent name sequences in hash chain
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* @subscriptions: list of subscriptions for this 'type'
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* @lock: spinlock controlling access to name sequence structure
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* @lock: spinlock controlling access to publication lists of all sub-sequences
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*/
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struct name_seq {
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@ -918,7 +918,9 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
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for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
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if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
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tipc_printf(buf, "%s ", typearea);
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spin_lock_bh(&seq->lock);
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subseq_list(sseq, buf, depth, index);
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spin_unlock_bh(&seq->lock);
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sprintf(typearea, "%10s", " ");
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}
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}
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