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authorAllan Stephens <allan.stephens@windriver.com>2008-06-04 17:38:22 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-04 17:38:22 -0700
commit307fdf5e7defcacf84db21cda18770b2bf5f5196 (patch)
tree09da0ae6ce3733ba53a68f907a877e2201ea1587
parent0f15d36453bbd02d404445dace49f4ae072f44e5 (diff)
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>
-rw-r--r--net/tipc/name_table.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 4455f13cfaf6..096f7bd240a0 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -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", " ");
}
}