linux-kernel - Re: [PATCH 1/2] bus: mhi: host: Add loopback driver with sysfs interface

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Message-ID: <97a640d0-d80c-4c96-8204-719493d258aa@web.de>
Date: Mon, 29 Sep 2025 11:14:20 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
 Sumit Kumar <sumit.kumar@....qualcomm.com>, mhi@...ts.linux.dev,
 linux-arm-msm@...r.kernel.org, Manivannan Sadhasivam <mani@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Akhil Vinod <akhil.vinod@....qualcomm.com>,
 Subramanian Ananthanarayanan
 <subramanian.ananthanarayanan@....qualcomm.com>,
 Vivek Pernamitta <quic_vpernami@...cinc.com>
Subject: Re: [PATCH 1/2] bus: mhi: host: Add loopback driver with sysfs
 interface

…
> +++ b/drivers/bus/mhi/host/mhi_loopback.c
> @@ -0,0 +1,348 @@
…
> +static ssize_t start_store(struct device *dev,
> +			   struct device_attribute *attr,
> +			   const char *buf, size_t count)
> +{
> +	struct mhi_loopback *mhi_lb = dev_get_drvdata(dev);
> +	void *send_buf, *recv_buf;
…
> +	guard(mutex)(&mhi_lb->lb_mutex);
…
> +free_buf:
> +	kfree(send_buf);
> +free_recv_buf:
> +	kfree(recv_buf);
> +unlock:
+	mhi_lb->loopback_in_progress = false;
> +	return ret;
> +}
…

Under which circumstances would you become interested to apply an attribute
like “__free(kfree)”?
https://elixir.bootlin.com/linux/v6.17-rc7/source/include/linux/slab.h#L476

Regards,
Markus