From: Sascha Hauer <s.hauer@pengutronix.de>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
linux-sh@vger.kernel.org, Vinod Koul <vinod.koul@intel.com>,
Magnus Damm <magnus.damm@gmail.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
linux-mmc@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>,
linux-serial@vger.kernel.org
Subject: Re: [alsa-devel] [PATCH 1/7 v2] dmaengine: add a simple dma library
Date: Thu, 26 Jan 2012 18:34:44 +0100 [thread overview]
Message-ID: <20120126173444.GM5446@pengutronix.de> (raw)
In-Reply-To: <1327589784-4287-2-git-send-email-g.liakhovetski@gmx.de>
Hi Guennadi,
On Thu, Jan 26, 2012 at 03:56:18PM +0100, Guennadi Liakhovetski wrote:
> This patch adds a library of functions, helping to implement dmaengine
> drivers for hardware, unable to handle scatter-gather lists natively.
> The first version of this driver only supports memcpy and slave DMA
> operation.
>
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> ---
>
[...]
> +
> +/*
> + * For slave DMA we assume, that there is a finite number of DMA slaves in the
> + * system, and that each such slave can only use a finite number of channels.
> + * We use slave channel IDs to make sure, that no such slave channel ID is
> + * allocated more than once.
> + */
> +static unsigned int slave_num = 256;
> +module_param(slave_num, uint, 0444);
> +
> +/* A bitmask with slave_num bits */
> +static unsigned long *simple_slave_used;
You never check that the slave ids passed into this code are
within the range of slave_num. Given that this is a user changeable
value this is a bit flawy.
Sascha
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next prev parent reply other threads:[~2012-01-26 17:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 14:56 [PATCH 0/7 v2] extract a simple dmaengine library from shdma.c Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Guennadi Liakhovetski
2012-01-26 17:34 ` Sascha Hauer [this message]
2012-01-26 21:07 ` [alsa-devel] " Guennadi Liakhovetski
2012-01-27 8:37 ` Shimoda, Yoshihiro
2012-01-27 8:48 ` Guennadi Liakhovetski
2012-01-31 11:03 ` Shimoda, Yoshihiro
2012-02-01 0:52 ` Guennadi Liakhovetski
2012-02-01 2:47 ` Shimoda, Yoshihiro
2012-02-02 22:19 ` Guennadi Liakhovetski
2012-02-03 8:47 ` Shimoda, Yoshihiro
2012-02-03 10:21 ` Guennadi Liakhovetski
2012-02-03 15:43 ` [PATCH/RFC] usb: fix renesas_usbhs to not schedule in atomic context Guennadi Liakhovetski
2012-02-05 14:54 ` Felipe Balbi
2012-02-06 10:11 ` Guennadi Liakhovetski
2012-02-06 10:31 ` Felipe Balbi
2012-02-06 8:52 ` Shimoda, Yoshihiro
2012-01-30 8:32 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Vinod Koul
2012-01-30 9:34 ` Guennadi Liakhovetski
2012-01-31 6:41 ` Vinod Koul
2012-01-31 8:59 ` Guennadi Liakhovetski
2012-02-01 5:38 ` Vinod Koul
2012-02-03 16:38 ` Guennadi Liakhovetski
2012-02-06 2:54 ` Vinod Koul
2012-02-06 9:53 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 2/7 v2] dma: shdma: prepare for simple DMA conversion Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 3/7 v2] mmc: sh_mmcif: remove unneeded struct sh_mmcif_dma, prepare for simple DMA Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 4/7 v2] mmc: sh_mobile_sdhi: prepare for conversion to " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 5/7 v2] serial: sh-sci: " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 6/7 v2] ASoC: SIU: " Guennadi Liakhovetski
2012-02-06 2:33 ` Vinod Koul
2012-02-06 9:11 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 7/7 v2] dma: shdma: convert to the simple DMA library Guennadi Liakhovetski
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