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[75.164.186.145]) by smtp.gmail.com with ESMTPSA id e130-20020a816988000000b00545b02d4af5sm189158ywc.48.2023.06.08.14.38.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jun 2023 14:38:32 -0700 (PDT) From: Jason Gerecke X-Google-Original-From: Jason Gerecke To: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires , Jiri Kosina Cc: Ping Cheng , Aaron Armstrong Skomra , Joshua Dickens , Peter Hutterer , Jason Gerecke , stable@vger.kernel.org Subject: [PATCH v2] HID: wacom: Use ktime_t rather than int when dealing with timestamps Date: Thu, 8 Jun 2023 14:38:28 -0700 Message-ID: <20230608213828.2108-1-jason.gerecke@wacom.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607214102.2113-1-jason.gerecke@wacom.com> References: <20230607214102.2113-1-jason.gerecke@wacom.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Code which interacts with timestamps needs to use the ktime_t type returned by functions like ktime_get. The int type does not offer enough space to store these values, and attempting to use it is a recipe for problems. In this particular case, overflows would occur when calculating/storing timestamps leading to incorrect values being reported to userspace. In some cases these bad timestamps cause input handling in userspace to appear hung. Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/901 Fixes: 17d793f3ed53 ("HID: wacom: insert timestamp to packed Bluetooth (BT)= events") CC: stable@vger.kernel.org Signed-off-by: Jason Gerecke Reviewed-by: Benjamin Tissoires --- v2: Use div_u64 to perform division to deal with ARC and ARM architectures (as found by the kernel test robot) drivers/hid/wacom_wac.c | 6 +++--- drivers/hid/wacom_wac.h | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 2ccf838371343..174bf03908d7c 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1314,7 +1314,7 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac= *wacom) struct input_dev *pen_input =3D wacom->pen_input; unsigned char *data =3D wacom->data; int number_of_valid_frames =3D 0; - int time_interval =3D 15000000; + ktime_t time_interval =3D 15000000; ktime_t time_packet_received =3D ktime_get(); int i; =20 @@ -1348,7 +1348,7 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac= *wacom) if (number_of_valid_frames) { if (wacom->hid_data.time_delayed) time_interval =3D ktime_get() - wacom->hid_data.time_delayed; - time_interval /=3D number_of_valid_frames; + time_interval =3D div_u64(time_interval, number_of_valid_frames); wacom->hid_data.time_delayed =3D time_packet_received; } =20 @@ -1359,7 +1359,7 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac= *wacom) bool range =3D frame[0] & 0x20; bool invert =3D frame[0] & 0x10; int frames_number_reversed =3D number_of_valid_frames - i - 1; - int event_timestamp =3D time_packet_received - frames_number_reversed * = time_interval; + ktime_t event_timestamp =3D time_packet_received - frames_number_reverse= d * time_interval; =20 if (!valid) continue; diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h index 1a40bb8c5810c..ee21bb260f22f 100644 --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -324,7 +324,7 @@ struct hid_data { int ps_connected; bool pad_input_event_flag; unsigned short sequence_number; - int time_delayed; + ktime_t time_delayed; }; =20 struct wacom_remote_data { --=20 2.41.0