From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Deepak Kumar Singh <deesin@qti.qualcomm.com>
Cc: clew@codeaurora.org, sibis@codeaurora.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-remoteproc@vger.kernel.org,
Deepak Kumar Singh <deesin@codeaurora.org>,
Andy Gross <agross@kernel.org>
Subject: Re: [PATCH V2 1/2] soc: qcom: aoss: Expose send for generic usecase
Date: Tue, 13 Apr 2021 16:12:54 -0500 [thread overview]
Message-ID: <YHYJVjvjUyXtrNmC@builder.lan> (raw)
In-Reply-To: <1617943188-23278-2-git-send-email-deesin@qti.qualcomm.com>
On Thu 08 Apr 23:39 CDT 2021, Deepak Kumar Singh wrote:
[..]
> +/**
> + * qmp_get() - get a qmp handle from a device
> + * @dev: client device pointer
> + *
> + * Return: handle to qmp device on success, ERR_PTR() on failure
> + */
> +struct qmp *qmp_get(struct device *dev)
> +{
> + struct platform_device *pdev;
> + struct device_node *np;
> + struct qmp *qmp;
> +
> + if (!dev || !dev->of_node)
> + return ERR_PTR(-EINVAL);
> +
> + np = of_parse_phandle(dev->of_node, "qcom,qmp", 0);
> + if (!np)
> + return ERR_PTR(-ENODEV);
> +
> + pdev = of_find_device_by_node(np);
> + if (!pdev)
> + return ERR_PTR(-EINVAL);
> +
> + qmp = platform_get_drvdata(pdev);
> + return qmp ? qmp : ERR_PTR(-EPROBE_DEFER);
> +}
> +EXPORT_SYMBOL(qmp_get);
> +
> +void qmp_put(struct platform_device *pdev)
> +{
> + platform_device_put(pdev);
I was expecting that the devres allocated struct qmp would stick around
until the struct device's release callback came. As described in my
answer to Mani yesterday I was wrong.
As such you need to make sure that struct qmp stays around until
qmp_remove() and all qmp_put() calls has been made.
I presume a reasonable way to achieve this is to not use devm to
allocate our struct qmp, add a kref to the object. So this would have to
be a kref_put() on that instead of the platform_device_put() I asked you
to implement here.
Sorry about that.
The rest of the patch looks good.
Regards,
Bjorn
next prev parent reply other threads:[~2021-04-13 21:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 4:39 [PATCH V2 0/2] soc: qcom: aoss: Expose send for generic usecase Deepak Kumar Singh
2021-04-09 4:39 ` [PATCH V2 1/2] " Deepak Kumar Singh
2021-04-13 21:12 ` Bjorn Andersson [this message]
2021-05-05 7:44 ` Deepak Kumar Singh
2021-04-09 4:39 ` [PATCH V2 2/2] soc: qcom: aoss: Add debugfs entry Deepak Kumar Singh
2021-04-09 8:09 ` Manivannan Sadhasivam
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