linux-kernel - Re: [PATCH v2] i2c: at91: use dma safe buffers

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Message-ID: <454e874e53bc5d15308a60bcef335d8c@walle.cc>
Date:   Mon, 02 May 2022 23:36:06 +0200
From:   Michael Walle <michael@...le.cc>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>, wsa@...nel.org
Cc:     linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: at91: use dma safe buffers

Am 2022-04-07 17:08, schrieb Michael Walle:
> The supplied buffer might be on the stack and we get the following 
> error
> message:
> [    3.312058] at91_i2c e0070600.i2c: rejecting DMA map of vmalloc 
> memory
> 
> Use i2c_{get,put}_dma_safe_msg_buf() to get a DMA-able memory region if
> necessary.
> 
> Fixes: 60937b2cdbf9 ("i2c: at91: add dma support")
> Signed-off-by: Michael Walle <michael@...le.cc>
> Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>

Wolfgang, will you pick this one?

-michael