On 03.03.2022 18:17, Michael Walle wrote:
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>
> 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.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Michael Walle <michael@xxxxxxxx>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@xxxxxxxxxxxxx>
> ---
>
> I'm not sure if or which Fixes: tag I should add to this patch. The issue
> seems to be since a very long time, but nobody seem to have triggered it.
> FWIW, I'm using the sff,sfp driver, which triggers this.
I think it should be:
Fixes: 60937b2cdbf9 ("i2c: at91: add dma support")
> + 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...
> + if (!dma_buf) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + dev->buf = dma_buf;
Thanks!
