netdev - Re: [PATCH v2 2/3] net: qrtr: Add MHI transport layer

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Date:   Sun, 26 Apr 2020 15:45:41 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Chris Lew <clew@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hemant Kumar <hemantk@...eaurora.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Siddartha Mohanadoss <smohanad@...eaurora.org>
Subject: Re: [PATCH v2 2/3] net: qrtr: Add MHI transport layer

> Hence, this commit adds MHI transport layer support to QRTR for
> transferring the QMI messages over IPC Router.

I suggest to reconsider software development consequences around
another implementation detail.


…
> +static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
> +{
…
> +	rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
> +			   MHI_EOT);
> +	if (rc) {
> +		kfree_skb(skb);
> +		return rc;
> +	}
…
> +}

I propose again to add a jump target so that a bit of exception handling code
can be better reused at the end of this function implementation.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?id=b2768df24ec400dd4f7fa79542f797e904812053#n450

+	if (rc)
+		goto free_skb;
…
+	return rc;
+
+free_skb:
+	kfree_skb(skb);
+	return rc;
+}


Regards,
Markus