[PATCH v3 0/5] ASoC / rpmsg / remoteproc / soc: qcom: Constify buffer passed to send functions

[Mathieu Poirier]

On Tue, 17 Mar 2026 at 06:37, Krzysztof Kozlowski
<krzysztof.kozlowski at oss.qualcomm.com> wrote:
>
> This got acks from Mathieu (remoteproc) and Mark (audio), so can we
> funnel everything via Qualcomm remoteproc tree?
>

I'm good with that.

> Dependencies / merging
> ======================
> Entire patchset is one logical chain, all further patches depend on
> previous ones, thus everything should be taken via same tree or shared
> between trees with tags.  Probably everything should go via ASoC with
> necessary acks.
>
> Changes in v3:
> - Subject fixes (Angelo)
> - Tags
> - Link to v2: https://patch.msgid.link/20260310-rpmsg-send-const-v2-0-0e94c5db9bf4@oss.qualcomm.com
>
> Changes in v2:
> - New patch #5: media: platform: mtk-mdp3: Constify buffer passed to mdp_vpu_sendmsg()
> - Rebase, add acks.
> - Link to v1: https://patch.msgid.link/20251130-rpmsg-send-const-v1-0-cb11c7e0a024@oss.qualcomm.com
>
> Description
> ===========
> The remoteproc and rpmsg send-like functions should not modify data
> being sent, so buffer should be marked as pointer to const.  This is not
> only self-documenting code but actually increases the actual safety and
> clearly documents who is the owner of passed buffer.
>
> Best regards,
> Krzysztof
>
> ---
> Krzysztof Kozlowski (5):
>       remoteproc: mtk_scp_ipi: Constify buffer passed to scp_ipi_send()
>       remoteproc: mtk_scp: Constify buffer passed to scp_send_ipi()
>       rpmsg: Constify buffer passed to send API
>       ASoC: qcom:: Constify GPR packet being send over GPR interface
>       media: platform: mtk-mdp3: Constify buffer passed to mdp_vpu_sendmsg()
>
>  .../media/platform/mediatek/mdp3/mtk-mdp3-vpu.c    |  2 +-
>  drivers/remoteproc/mtk_scp.c                       |  2 +-
>  drivers/remoteproc/mtk_scp_ipi.c                   |  2 +-
>  drivers/rpmsg/mtk_rpmsg.c                          |  4 ++--
>  drivers/rpmsg/qcom_glink_native.c                  | 13 +++++++-----
>  drivers/rpmsg/qcom_smd.c                           | 10 +++++----
>  drivers/rpmsg/rpmsg_core.c                         |  8 ++++----
>  drivers/rpmsg/rpmsg_internal.h                     |  8 ++++----
>  drivers/rpmsg/virtio_rpmsg_bus.c                   | 24 ++++++++++++----------
>  drivers/soc/qcom/apr.c                             |  8 ++++----
>  include/linux/remoteproc/mtk_scp.h                 |  2 +-
>  include/linux/rpmsg.h                              | 17 +++++++--------
>  include/linux/rpmsg/mtk_rpmsg.h                    |  2 +-
>  include/linux/soc/qcom/apr.h                       |  4 ++--
>  sound/soc/qcom/qdsp6/audioreach.c                  |  6 +++---
>  sound/soc/qcom/qdsp6/audioreach.h                  |  4 ++--
>  sound/soc/qcom/qdsp6/q6apm.c                       |  3 ++-
>  sound/soc/qcom/qdsp6/q6apm.h                       |  2 +-
>  18 files changed, 65 insertions(+), 56 deletions(-)
> ---
> base-commit: 2360a9a195d2eae6f7d0cac2cbe920ae8a06c54f
> change-id: 20251130-rpmsg-send-const-ae216a1fbd8f
>
> Best regards,
> --
> Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>
>