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SubjectRe: [PATCH v2] serial: sh-sci: disable DMA for uart_console
Hi George,

On Mon, May 13, 2019 at 5:48 PM George G. Davis <> wrote:
> As noted in commit 84b40e3b57ee ("serial: 8250: omap: Disable DMA for
> console UART"), UART console lines use low-level PIO only access functions
> which will conflict with use of the line when DMA is enabled, e.g. when
> the console line is also used for systemd messages. So disable DMA
> support for UART console lines.
> Fixes:

I don't think this is an appropriate reference, as it points to a patch that
was never applied.

As the problem has basically existed forever, IMHO no Fixes tag
is needed.

> Reported-by: Michael Rodin <>
> Tested-by: Eugeniu Rosca <>
> Reviewed-by: Simon Horman <>
> Reviewed-by: Wolfram Sang <>
> Cc:
> Signed-off-by: George G. Davis <>
> ---
> v2: Clarify comment regarding DMA support on kernel console,
> add {Tested,Reviewed}-by:, and Cc: linux-stable lines.

Thanks for the update!

Reviewed-by: Geert Uytterhoeven <>



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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