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authorAllan Stephens <allan.stephens@windriver.com>2008-05-05 01:21:12 -0700
committerDavid S. Miller <davem@davemloft.net>2008-05-05 01:21:12 -0700
commit93758c3da19e99f5377cc1413c27320882b18f4b (patch)
treec39c0b8cc681e8588f10ec4bb14596811d293c4d /net/tipc
parentfb98ec71c7f81b6db9b793aeb9d53823b6960d8b (diff)
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tipc: Fix recursive spinlock invocation in print buffer code
This patch fixes two routines that allow the global print buffer spinlock to be taken recursively. 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/dbg.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c
index c680691..834319e 100644
--- a/net/tipc/dbg.c
+++ b/net/tipc/dbg.c
@@ -179,8 +179,10 @@ void tipc_printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from)
}
if (pb_to->size < pb_from->size) {
- tipc_printbuf_reset(pb_to);
- tipc_printf(pb_to, "*** PRINT BUFFER MOVE ERROR ***");
+ strcpy(pb_to->buf, "*** PRINT BUFFER MOVE ERROR ***");
+ pb_to->buf[pb_to->size - 1] = ~0;
+ pb_to->crs = strchr(pb_to->buf, 0);
+ pb_to->next = NULL;
return;
}
@@ -405,27 +407,32 @@ struct sk_buff *tipc_log_dump(void)
struct sk_buff *reply;
spin_lock_bh(&print_lock);
- if (!TIPC_LOG->buf)
+ if (!TIPC_LOG->buf) {
+ spin_unlock_bh(&print_lock);
reply = tipc_cfg_reply_ultra_string("log not activated\n");
- else if (tipc_printbuf_empty(TIPC_LOG))
+ } else if (tipc_printbuf_empty(TIPC_LOG)) {
+ spin_unlock_bh(&print_lock);
reply = tipc_cfg_reply_ultra_string("log is empty\n");
+ }
else {
struct tlv_desc *rep_tlv;
struct print_buf pb;
int str_len;
str_len = min(TIPC_LOG->size, 32768u);
+ spin_unlock_bh(&print_lock);
reply = tipc_cfg_reply_alloc(TLV_SPACE(str_len));
if (reply) {
rep_tlv = (struct tlv_desc *)reply->data;
tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), str_len);
+ spin_lock_bh(&print_lock);
tipc_printbuf_move(&pb, TIPC_LOG);
+ spin_unlock_bh(&print_lock);
str_len = strlen(TLV_DATA(rep_tlv)) + 1;
skb_put(reply, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
}
}
- spin_unlock_bh(&print_lock);
return reply;
}