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| author | Allan Stephens <allan.stephens@windriver.com> | 2008-06-05 02:38:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-05 02:38:22 +0200 |
| commit | 307fdf5e7defcacf84db21cda18770b2bf5f5196 (patch) | |
| tree | 09da0ae6ce3733ba53a68f907a877e2201ea1587 /net/tipc | |
| parent | tipc: Prevent display of name table types with no publications (diff) | |
| download | linux-307fdf5e7defcacf84db21cda18770b2bf5f5196.tar.xz linux-307fdf5e7defcacf84db21cda18770b2bf5f5196.zip | |
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>
Diffstat (limited to 'net/tipc')
| -rw-r--r-- | net/tipc/name_table.c | 4 |
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", " "); } } |