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commit60de2d2dc2upstream. The txdone can re-fill the mailbox. Keep polling the mailbox during the flush until all the messages have been delivered. This fixes an issue with the Tegra Combined UART (TCU) where output can get truncated under high traffic load. Signed-off-by: Pekka Pessi <ppessi@nvidia.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Fixes:91b1b1c3da("mailbox: tegra-hsp: Add support for shared mailboxes") Cc: stable@vger.kernel.org Signed-off-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>