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  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:   Fri, 14 Jun 2019 14:43:22 -0500
From:   Andy Gross <>
To:     Srinivas Kandagatla <>
Subject: Re: [PATCH] dmaengine: qcom-bam: fix circular buffer handling

On Fri, Jun 14, 2019 at 03:20:12PM +0100, Srinivas Kandagatla wrote:
> For some reason arguments to most of the circular buffers
> macros are used in reverse, tail is used for head and vice versa.
> This leads to bam thinking that there is an extra descriptor at the
> end and leading to retransmitting descriptor which was not scheduled
> by any driver. This happens after MAX_DESCRIPTORS (4096) are scheduled
> and done, so most of the drivers would not notice this, unless they are
> heavily using bam dma. Originally found this issue while testing
> SoundWire over SlimBus on DB845c which uses DMA very heavily for
> read/writes.
> Signed-off-by: Srinivas Kandagatla <>

Reviewed-by: Andy Gross <>

Powered by blists - more mailing lists