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authorTilman Schmidt <tilman@imap.cc>2012-04-25 13:02:19 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-07 22:37:56 -0400
commit8e618aad5348b6e6c5a90e8d97ea643197963b20 (patch)
tree11fe2cb5180939cc703444fca5071cfd327f79d5 /drivers/isdn
parent8a05ba0812f7a456b3eddf74b127c0d8791742a7 (diff)
isdn/gigaset: ratelimit CAPI message dumps
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 <tilman@imap.cc> CC: stable <stable@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/gigaset/capi.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/drivers/isdn/gigaset/capi.c b/drivers/isdn/gigaset/capi.c
index 343b5c80cb7b..292ca2fc852c 100644
--- a/drivers/isdn/gigaset/capi.c
+++ b/drivers/isdn/gigaset/capi.c
@@ -14,6 +14,7 @@
#include "gigaset.h"
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/ratelimit.h>
#include <linux/isdn/capilli.h>
#include <linux/isdn/capicmd.h>
#include <linux/isdn/capiutil.h>
@@ -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);
}