linux-kernel - Re: [PATCH v2 5/6] i2c: i2c-stm32f7: Add DMA support

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]

Message-ID: <20180403153925.lg37rezuvs6hefks@ninjato>
Date:   Tue, 3 Apr 2018 17:39:25 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Pierre-Yves MORDRET <pierre-yves.mordret@...com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] i2c: i2c-stm32f7: Add DMA support


> +#define STM32F7_I2C_DMA_LEN_MIN			0x1
...

> +	if (i2c_dev->dma && f7_msg->count >= STM32F7_I2C_DMA_LEN_MIN) {

Are you using DMA for every message with a length >= 1? The setup of
that might be more expensive than the DMA gain, if so.


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)