From: <Codrin.Ciubotariu@microchip.com>
To: <michael@walle.cc>
Cc: <Nicolas.Ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<Claudiu.Beznea@microchip.com>, <sumit.semwal@linaro.org>,
<christian.koenig@amd.com>, <linux-i2c@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>,
<dri-devel@lists.freedesktop.org>,
<linaro-mm-sig@lists.linaro.org>, <stable@vger.kernel.org>
Subject: Re: [PATCH] i2c: at91: use dma safe buffers
Date: Tue, 5 Apr 2022 10:02:34 +0000 [thread overview]
Message-ID: <360914ee-594c-86bc-2436-aa863a67953a@microchip.com> (raw)
In-Reply-To: <bc32f1107786ebcbfb4952e1a6142304@walle.cc>
On 05.04.2022 12:38, Michael Walle wrote:
> Am 2022-04-05 11:23, schrieb Codrin.Ciubotariu@microchip.com:
>>> + if (dev->use_dma) {
>>> + dma_buf = i2c_get_dma_safe_msg_buf(m_start, 1);
>>
>> If you want, you could just dev->buf = i2c_get_dma_safe...
>
> But where is the error handling in that case? dev->buf will
> be NULL, which is eventually passed to dma_map_single().
>
> Also, I need the dma_buf for the i2c_put_dma_safe_msg_buf()
> call anyway, because dev->buf will be modified during
> processing.
You still:
if (!dev->buf) {
ret = -ENOMEM;
goto out;
}
So, at91_do_twi_transfer()/dma_map_single() will not be called.
Best regards,
Codrin
next prev parent reply other threads:[~2022-04-06 0:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-03 16:17 [PATCH] i2c: at91: use dma safe buffers Michael Walle
2022-03-04 7:35 ` Christian König
2022-03-04 8:04 ` Wolfram Sang
2022-03-04 8:10 ` Christian König
2022-03-04 8:43 ` Wolfram Sang
2022-03-04 8:54 ` Christian König
2022-03-28 7:35 ` Michael Walle
2022-04-05 9:23 ` Codrin.Ciubotariu
2022-04-05 9:38 ` Michael Walle
2022-04-05 10:02 ` Codrin.Ciubotariu [this message]
2022-04-05 11:09 ` Michael Walle
2022-04-05 13:58 ` Codrin.Ciubotariu
2022-04-05 14:08 ` Michael Walle
2022-04-07 11:50 ` Codrin.Ciubotariu
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