[PATCH v2 4/4] soc: apple: rtkit: rate limit malformed syslog warnings

[Laxman Acharya Padhya]

The coprocessor can repeatedly send malformed syslog messages and flood
the kernel log with warnings. Use the rate-limited warning helper for
the validation failures in the syslog receive path.

Fixes: 9bd1d9a0d8bb ("soc: apple: Add RTKit IPC library")
Cc: stable at vger.kernel.org
Signed-off-by: Laxman Acharya Padhya <acharyalaxman8848 at gmail.com>
---
 drivers/soc/apple/rtkit.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index da766df5a6d7..e70e3d2cfa08 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -439,7 +439,8 @@ static void apple_rtkit_syslog_rx_init(struct apple_rtkit *rtk, u64 msg)
 	rtk->syslog_msg_size = FIELD_GET(APPLE_RTKIT_SYSLOG_MSG_SIZE, msg);
 
 	if (rtk->syslog_msg_size == 0) {
-		dev_warn(rtk->dev, "RTKit: syslog msg_size is zero\n");
+		dev_warn_ratelimited(rtk->dev,
+				     "RTKit: syslog msg_size is zero\n");
 		return;
 	}
 
@@ -464,26 +465,24 @@ static void apple_rtkit_syslog_rx_log(struct apple_rtkit *rtk, u64 msg)
 	int msglen;
 
 	if (!rtk->syslog_msg_buffer || rtk->syslog_msg_size == 0) {
-		dev_warn(
-			rtk->dev,
-			"RTKit: received syslog message but no syslog_msg_buffer\n");
+		dev_warn_ratelimited(rtk->dev,
+				     "RTKit: received syslog message but no syslog_msg_buffer\n");
 		goto done;
 	}
 	if (!rtk->syslog_buffer.size) {
-		dev_warn(
-			rtk->dev,
-			"RTKit: received syslog message but syslog_buffer.size is zero\n");
+		dev_warn_ratelimited(rtk->dev,
+				     "RTKit: received syslog message but syslog_buffer.size is zero\n");
 		goto done;
 	}
 	if (!rtk->syslog_buffer.buffer && !rtk->syslog_buffer.iomem) {
-		dev_warn(
-			rtk->dev,
-			"RTKit: received syslog message but no syslog_buffer.buffer or syslog_buffer.iomem\n");
+		dev_warn_ratelimited(rtk->dev,
+				     "RTKit: received syslog message but no syslog_buffer.buffer or syslog_buffer.iomem\n");
 		goto done;
 	}
 	if (idx >= rtk->syslog_n_entries) {
-		dev_warn(rtk->dev, "RTKit: syslog index %d out of range\n",
-			 idx);
+		dev_warn_ratelimited(rtk->dev,
+				     "RTKit: syslog index %d out of range\n",
+				     idx);
 		goto done;
 	}
 
-- 
2.51.2