linux-kernel - Re: [PATCH 3/9] crypto: qce: Add dma and sg helpers

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Message-ID: <20140403182520.GH28265@joshc.qualcomm.com>
Date:	Thu, 3 Apr 2014 13:25:21 -0500
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Stanimir Varbanov <svarbanov@...sol.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/9] crypto: qce: Add dma and sg helpers

Nitworthy comments :).

On Thu, Apr 03, 2014 at 07:18:00PM +0300, Stanimir Varbanov wrote:
[..]
> +++ b/drivers/crypto/qce/dma.c
[..]
> +int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
> +{
> +	unsigned int memsize;
> +	void *va;
> +	int ret;
> +
> +	dma->txchan = dma_request_slave_channel_reason(dev, "tx");
> +	if (IS_ERR(dma->txchan)) {
> +		ret = PTR_ERR(dma->txchan);
> +		return ret;
> +	}
> +
> +	dma->rxchan = dma_request_slave_channel_reason(dev, "rx");
> +	if (IS_ERR(dma->rxchan)) {
> +		ret = PTR_ERR(dma->rxchan);
> +		goto error_rx;
> +	}
> +
> +	memsize = QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ;
> +	va = kzalloc(memsize, GFP_KERNEL);
> +	if (!va) {
> +		ret = -ENOMEM;
> +		goto error_nomem;
> +	}
> +
> +	dma->result_buf = va;
> +	dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
> +
> +	return 0;
> +error_nomem:
> +	if (!IS_ERR(dma->rxchan))

How could this condition ever be false?

> +		dma_release_channel(dma->rxchan);
> +error_rx:
> +	if (!IS_ERR(dma->txchan))

Same here.

> +		dma_release_channel(dma->txchan);
> +	return ret;
> +}

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