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[B/D/E/OEM-OSP1-B,3/3] HID: core: fix dmesg flooding if report field larger than 32bit

Message ID 20191030071652.8130-4-kai.heng.feng@canonical.com
State New
Headers show
Series Suppress "hid_field_extract() called with n (192) > 32!" message floods | expand

Commit Message

Kai-Heng Feng Oct. 30, 2019, 7:16 a.m. UTC 
From: Joshua Clayton <stillcompiling@gmail.com>

BugLink: https://bugs.launchpad.net/bugs/1850600

Only warn once of oversize hid report value field

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.

The size of the hid report field data structure should probably be increased.
The data structure is treated as a u32 in Linux, but an unlimited number
of bits in the USB hid spec, so there is some rearchitecture needed now that
devices are sending more than 32 bits.

Signed-off-by: Joshua Clayton <stillcompiling@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
(cherry picked from commit 0af10eed9b7308187c7865024248b2a2a5aa382a)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/hid/hid-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 39eba8106d40..81df03e1bb24 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1314,8 +1314,8 @@  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;
 	}