linux-kernel - [PATCH 2/2] HID: core: only warn once of oversize hid report

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Date:   Mon, 22 Jul 2019 10:36:42 -0600
From:   stillcompiling@...il.com
To:     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 2/2] 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 other kernel logs
Protect dmesg by printing the warning only one time.

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

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 210b81a56e1a..7afd0422b280 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1311,7 +1311,7 @@ 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",
+		hid_warn_once(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n",
 			 n, current->comm);
 		n = 32;
 	}
-- 
2.21.0