The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 862cf85fef85becc55a173387527adb4f076fab0 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2024021906-stoplight-preorder-1867@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: 862cf85fef85 ("iio: commom: st_sensors: ensure proper DMA alignment") 474010127e25 ("iio: st_sensors: Add a local lock for protecting odr") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 862cf85fef85becc55a173387527adb4f076fab0 Mon Sep 17 00:00:00 2001 From: Nuno Sa <nuno.sa@xxxxxxxxxx> Date: Wed, 31 Jan 2024 10:16:47 +0100 Subject: [PATCH] iio: commom: st_sensors: ensure proper DMA alignment Aligning the buffer to the L1 cache is not sufficient in some platforms as they might have larger cacheline sizes for caches after L1 and thus, we can't guarantee DMA safety. That was the whole reason to introduce IIO_DMA_MINALIGN in [1]. Do the same for st_sensors common buffer. While at it, moved the odr_lock before buffer_data as we definitely don't want any other data to share a cacheline with the buffer. [1]: https://lore.kernel.org/linux-iio/20220508175712.647246-2-jic23@xxxxxxxxxx/ Fixes: e031d5f558f1 ("iio:st_sensors: remove buffer allocation at each buffer enable") Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx> Cc: <Stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240131-dev_dma_safety_stm-v2-1-580c07fae51b@xxxxxxxxxx Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h index 607c3a89a647..f9ae5cdd884f 100644 --- a/include/linux/iio/common/st_sensors.h +++ b/include/linux/iio/common/st_sensors.h @@ -258,9 +258,9 @@ struct st_sensor_data { bool hw_irq_trigger; s64 hw_timestamp; - char buffer_data[ST_SENSORS_MAX_BUFFER_SIZE] ____cacheline_aligned; - struct mutex odr_lock; + + char buffer_data[ST_SENSORS_MAX_BUFFER_SIZE] __aligned(IIO_DMA_MINALIGN); }; #ifdef CONFIG_IIO_BUFFER
