linux-kernel - Re: [PATCH 1/2] spi: Add DMA support for spi_flash

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 12 Apr 2016 05:31:15 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Vignesh R <vigneshr@...com>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 1/2] spi: Add DMA support for spi_flash_read()

On Tue, Apr 05, 2016 at 09:19:51AM +0530, Vignesh R wrote:

>  	mutex_lock(&master->bus_lock_mutex);
> +	if (master->dma_rx) {
> +		rx_dev = master->dma_rx->device->dev;
> +		ret = spi_map_buf(master, rx_dev, &msg->rx_sg,
> +				  msg->buf, msg->len,
> +				  DMA_FROM_DEVICE);
> +		if (ret != 0)
> +			goto  err;
> +	}

This is unconditionally DMA mapping the buffer if DMA is supported.
That's going to be common but I'm not sure it'll be universal, we need
to think of something better here.  I'm not immediately seeing what
though.  Possibly a flag...

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)