Messages in this thread | | | Date | Thu, 26 Jan 2012 22:07:50 +0100 (CET) | From | Guennadi Liakhovetski <> | Subject | Re: [alsa-devel] [PATCH 1/7 v2] dmaengine: add a simple dma library |
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Hi Sascha
On Thu, 26 Jan 2012, Sascha Hauer wrote:
> 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.
Right, never trust the user;-) I'll fix that.
Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/
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