From: Allan Stephens Date: Mon, 5 May 2008 08:21:12 +0000 (-0700) Subject: tipc: Fix recursive spinlock invocation in print buffer code X-Git-Tag: v2.6.27-rc1~969^2~535 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93758c3da19e99f5377cc1413c27320882b18f4b;p=linux-2.6 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 Signed-off-by: David S. Miller --- diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c index c680691059..834319e3b7 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; }