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SubjectRe: [PATCH v4 1/2] soc: qcom: aoss: Expose send for generic usecase
Quoting Sibi Sankar (2021-06-09 04:18:51)
> From: Deepak Kumar Singh <deesin@codeaurora.org>
>
> Not all upcoming usecases will have an interface to allow the aoss
> driver to hook onto. Expose the send api and create a get function to
> enable drivers to send their own messages to aoss.
>
> Signed-off-by: Chris Lew <clew@codeaurora.org>
> Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
>
> v4:
> * Fix compilation error due to missing qmp_put
> * Minor typos [s/tarcks/tracks]
>
> drivers/soc/qcom/qcom_aoss.c | 70 ++++++++++++++++++++++++++++++++++++--
> include/linux/soc/qcom/qcom_aoss.h | 36 ++++++++++++++++++++
> 2 files changed, 104 insertions(+), 2 deletions(-)
> create mode 100644 include/linux/soc/qcom/qcom_aoss.h
>
> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> index 934fcc4d2b05..e8f48760bac8 100644
> --- a/drivers/soc/qcom/qcom_aoss.c
> +++ b/drivers/soc/qcom/qcom_aoss.c
> @@ -522,13 +582,14 @@ static int qmp_probe(struct platform_device *pdev)
> int irq;
> int ret;
>
> - qmp = devm_kzalloc(&pdev->dev, sizeof(*qmp), GFP_KERNEL);
> + qmp = kzalloc(sizeof(*qmp), GFP_KERNEL);
> if (!qmp)
> return -ENOMEM;
>
> qmp->dev = &pdev->dev;
> init_waitqueue_head(&qmp->event);
> mutex_init(&qmp->tx_lock);
> + kref_init(&qmp->refcount);
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> qmp->msgram = devm_ioremap_resource(&pdev->dev, res);
> @@ -569,6 +630,8 @@ static int qmp_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, qmp);
>
> + atomic_set(&qmp->orphan, 0);
> +
> return 0;
>
> err_remove_qdss_clk:
> @@ -577,6 +640,7 @@ static int qmp_probe(struct platform_device *pdev)
> qmp_close(qmp);
> err_free_mbox:
> mbox_free_channel(qmp->mbox_chan);
> + kfree(qmp);
>
> return ret;
> }
> @@ -590,7 +654,9 @@ static int qmp_remove(struct platform_device *pdev)
> qmp_cooling_devices_remove(qmp);
>
> qmp_close(qmp);
> + atomic_set(&qmp->orphan, 1);

This looks odd. Why are we letting the device be removed while it is in
use by other drivers? Can't we pin the device with get_device() so it
can't be removed and then prevent the driver from being removed until
all the consumer drivers drop the reference, i.e. suppress sysfs unbind?

Otherwise it looks like a generic problem that all provider devices,
clks, regulators, gpios, etc. have to deal with and thus this
hand-rolled mechanism can't be right.

> mbox_free_channel(qmp->mbox_chan);
> + kref_put(&qmp->refcount, qmp_handle_release);
>
> return 0;
> }

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