From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tilman Schmidt Subject: [PATCH 1/8] isdn/gigaset: ratelimit CAPI message dumps Date: Thu, 26 Apr 2012 01:02:19 +0200 (CEST) Message-ID: <20120425-patch-gigaset-01.tilman@imap.cc> References: <20120425-patch-gigaset-00.tilman@imap.cc> Cc: Hansjoerg Lipp , Karsten Keil , i4ldeveloper@listserv.isdn4linux.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: Karsten Keil , David Miller Return-path: In-Reply-To: <20120425-patch-gigaset-00.tilman@imap.cc> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Introduce a global ratelimit for CAPI message dumps to protect against possible log flood. Drop the ratelimit for ignored messages which is now covered by the global one. Signed-off-by: Tilman Schmidt CC: stable --- drivers/isdn/gigaset/capi.c | 22 +++++++++------------- 1 files changed, 9 insertions(+), 13 deletions(-) diff --git a/drivers/isdn/gigaset/capi.c b/drivers/isdn/gigaset/capi.c index 343b5c8..292ca2f 100644 --- a/drivers/isdn/gigaset/capi.c +++ b/drivers/isdn/gigaset/capi.c @@ -14,6 +14,7 @@ #include "gigaset.h" #include #include +#include #include #include #include @@ -223,10 +224,14 @@ get_appl(struct gigaset_capi_ctr *iif, u16 appl) static inline void dump_cmsg(enum debuglevel level, const char *tag, _cmsg *p) { #ifdef CONFIG_GIGASET_DEBUG + /* dump at most 20 messages in 20 secs */ + static DEFINE_RATELIMIT_STATE(msg_dump_ratelimit, 20 * HZ, 20); _cdebbuf *cdb; if (!(gigaset_debuglevel & level)) return; + if (!___ratelimit(&msg_dump_ratelimit, tag)) + return; cdb = capi_cmsg2str(p); if (cdb) { @@ -2059,12 +2064,6 @@ static void do_reset_b3_req(struct gigaset_capi_ctr *iif, } /* - * dump unsupported/ignored messages at most twice per minute, - * some apps send those very frequently - */ -static unsigned long ignored_msg_dump_time; - -/* * unsupported CAPI message handler */ static void do_unsupported(struct gigaset_capi_ctr *iif, @@ -2073,8 +2072,7 @@ static void do_unsupported(struct gigaset_capi_ctr *iif, { /* decode message */ capi_message2cmsg(&iif->acmsg, skb->data); - if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000)) - dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg); + dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg); send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState); } @@ -2085,11 +2083,9 @@ static void do_nothing(struct gigaset_capi_ctr *iif, struct gigaset_capi_appl *ap, struct sk_buff *skb) { - if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000)) { - /* decode message */ - capi_message2cmsg(&iif->acmsg, skb->data); - dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg); - } + /* decode message */ + capi_message2cmsg(&iif->acmsg, skb->data); + dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg); dev_kfree_skb_any(skb); } -- 1.7.3.4