linux-kernel - Re: [PATCH] dmaengine: jz4780: set DMA maximum segment size

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] [day] [month] [year] [list]

Message-ID: <Yl/x5BNqlKjxYgif@matsya>
Date:   Wed, 20 Apr 2022 17:13:32 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     paul@...pouillou.net, linux-mips@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: jz4780: set DMA maximum segment size

On 11-04-22, 16:36, Aidan MacDonald wrote:
> Set the maximum segment size, since the hardware can do transfers larger
> than the default 64 KiB returned by dma_get_max_seg_size().
> 
> The maximum segment size is limited by the 24-bit transfer count field
> in DMA descriptors. The number of bytes is equal to the transfer count
> times the transfer size unit, which is selected by the driver based on
> the DMA buffer address and length of the transfer. The size unit can be
> as small as 1 byte, so set the maximum segment size to 2^24-1 bytes to
> ensure the transfer count will not overflow regardless of the size unit
> selected by the driver.

Applied, thanks

-- 
~Vinod