Hi George,
On Mon, May 13, 2019 at 5:48 PM George G. Davis george_davis@mentor.com 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.
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 mrodin@de.adit-jv.com Tested-by: Eugeniu Rosca erosca@de.adit-jv.com Reviewed-by: Simon Horman horms+renesas@verge.net.au Reviewed-by: Wolfram Sang wsa+renesas@sang-engineering.com Cc: stable@vger.kernel.org Signed-off-by: George G. Davis george_davis@mentor.com
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+renesas@glider.be
Gr{oetje,eeting}s,
Geert