linux-kernel - [PATCH v3 3/3] HID: core: only warn once of oversize hid report

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Message-Id: <20190722214827.29257-3-stillcompiling@gmail.com>
Date:   Mon, 22 Jul 2019 15:48:27 -0600
From:   stillcompiling@...il.com
To:     Joe Perches <joe@...ches.com>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org (open list:HID CORE LAYER),
        linux-kernel@...r.kernel.org (open list)
Cc:     Joshua Clayton <stillcompiling@...il.com>
Subject: [PATCH v3 3/3] HID: core: only warn once of oversize hid report

From: Joshua Clayton <stillcompiling@...il.com>

On HP spectre x360 convertible the message:
hid-sensor-hub 001F:8087:0AC2.0002: hid_field_extract() called with n (192) > 32! (kworker/1:2)
is continually printed many times per second, crowding out all else
Protect dmesg by printing the warning only one time.

Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
---
 drivers/hid/hid-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 210b81a56e1a..3eaee2c37931 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1311,8 +1311,8 @@ u32 hid_field_extract(const struct hid_device *hid, u8 *report,
 			unsigned offset, unsigned n)
 {
 	if (n > 32) {
-		hid_warn(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n",
-			 n, current->comm);
+		hid_warn_once(hid, "%s() called with n (%d) > 32! (%s)\n",
+			      __func__, n, current->comm);
 		n = 32;
 	}
 
-- 
2.21.0