From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50A343644D3 for ; Sun, 29 Mar 2026 13:28:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774790926; cv=none; b=f+H/x/rOL5lN3CbTbQStvwxFtGefosWlL8lYrLPl8bA0Lypft9o04s2PFcszdUbfp/DaQHdpnSoxsAVc4m+MlIfQ/wf8lwWPgGO7SRuPebqbC44DH4aBcT86AjS2+kmY/JQfhWsy6K56AMEDz+wfoe9+2zwyQl1uyWa6wqZ2hzU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774790926; c=relaxed/simple; bh=gTvPqE6CoNVMl9R7LJ48/iO2lEL0d1stjyowwUy54rg=; h=Subject:To:From:Date:Message-ID:MIME-Version:Content-Type; b=VdbJciHoYozrJ6W+XVyfYQboGvvE72j0lhfRjcKvWAmmzAqB6NdESMsL5GrMRrVu6Y9eoS7j63oxLayHzL+EuZlHVKK85iuvaRnTw9WqJXLyE5mnuCgc8VGt+hwSC/5OsilYLyTdJqxvgPVr+8SO7uhMOtp5zVoQV6odkgJUy2w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rJ7TqpBX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rJ7TqpBX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFD76C116C6; Sun, 29 Mar 2026 13:28:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774790926; bh=gTvPqE6CoNVMl9R7LJ48/iO2lEL0d1stjyowwUy54rg=; h=Subject:To:From:Date:From; b=rJ7TqpBXyKCUPHwRJJC8HoZYqQ9JPAIjaHjw97TfxeZnVGMg3qt4+gxYrnhaH2rg5 8GWUdt/CXl6M9SMH+mLBRMR3+LOTCLOVgQ9MJLScyIKbhVMtsG65rNT7MtMwr7bDr+ EIxMJQ6heq/zlC4ed8aP7nY6A7ZRc2+iMCMmlcKU= Subject: patch "iio: orientation: hid-sensor-rotation: add timestamp hack to not" added to char-misc-linus To: dlechner@baylibre.com,Jonathan.Cameron@huawei.com,Stable@vger.kernel.org,jic23@kernel.org,nuno.sa@analog.com From: Date: Sun, 29 Mar 2026 15:28:13 +0200 Message-ID: <2026032913-handled-sandpaper-c385@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is a note to let you know that I've just added the patch titled iio: orientation: hid-sensor-rotation: add timestamp hack to not to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From 79a86a6cc3669416a21fef32d0767d39ba84b3aa Mon Sep 17 00:00:00 2001 From: David Lechner Date: Sat, 7 Mar 2026 19:44:09 -0600 Subject: iio: orientation: hid-sensor-rotation: add timestamp hack to not break userspace MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a hack to push two timestamps in the hid-sensor-rotation scan data to avoid breaking userspace applications that depend on the timestamp being at the incorrect location in the scan data due to unintentional misalignment in older kernels. When this driver was written, the timestamp was in the correct location because of the way iio_compute_scan_bytes() was implemented at the time. (Samples were 24 bytes each.) Then commit 883f61653069 ("iio: buffer: align the size of scan bytes to size of the largest element") changed the computed scan_bytes to be a different size (32 bytes), which caused iio_push_to_buffers_with_timestamp() to place the timestamp at an incorrect offset. There have been long periods of time (6 years each) where the timestamp was in either location, so to not break either case, we open-code the timestamps to be pushed to both locations in the scan data. Reported-by: Jonathan Cameron Closes: https://lore.kernel.org/linux-iio/20260215162351.79f40b32@jic23-huawei/ Fixes: 883f61653069 ("iio: buffer: align the size of scan bytes to size of the largest element") Signed-off-by: David Lechner Reviewed-by: Nuno Sá Cc: Signed-off-by: Jonathan Cameron --- drivers/iio/orientation/hid-sensor-rotation.c | 22 ++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/iio/orientation/hid-sensor-rotation.c b/drivers/iio/orientation/hid-sensor-rotation.c index 6806481873be..5a5e6e4fbe34 100644 --- a/drivers/iio/orientation/hid-sensor-rotation.c +++ b/drivers/iio/orientation/hid-sensor-rotation.c @@ -20,7 +20,12 @@ struct dev_rot_state { struct hid_sensor_hub_attribute_info quaternion; struct { IIO_DECLARE_QUATERNION(s32, sampled_vals); - aligned_s64 timestamp; + /* + * ABI regression avoidance: There are two copies of the same + * timestamp in case of userspace depending on broken alignment + * from older kernels. + */ + aligned_s64 timestamp[2]; } scan; int scale_pre_decml; int scale_post_decml; @@ -154,8 +159,19 @@ static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev, if (!rot_state->timestamp) rot_state->timestamp = iio_get_time_ns(indio_dev); - iio_push_to_buffers_with_timestamp(indio_dev, &rot_state->scan, - rot_state->timestamp); + /* + * ABI regression avoidance: IIO previously had an incorrect + * implementation of iio_push_to_buffers_with_timestamp() that + * put the timestamp in the last 8 bytes of the buffer, which + * was incorrect according to the IIO ABI. To avoid breaking + * userspace that may be depending on this broken behavior, we + * put the timestamp in both the correct place [0] and the old + * incorrect place [1]. + */ + rot_state->scan.timestamp[0] = rot_state->timestamp; + rot_state->scan.timestamp[1] = rot_state->timestamp; + + iio_push_to_buffers(indio_dev, &rot_state->scan); rot_state->timestamp = 0; } -- 2.53.0