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This reverts commit7bfb915a59. This commit broke pxa and omap-serial, because it inhibited them from calling stop_tx() if their TX FIFOs weren't completely empty. This resulted in these two drivers hanging during transmits because the TX interrupt would stay enabled, and a new TX interrupt would never fire. Cc: stable@vger.kernel.org Fixes:7bfb915a59("serial: core: only stop transmit when HW fifo is empty") Signed-off-by: Doug Brown <doug@schmorgal.com> Link: https://lore.kernel.org/r/20240606195632.173255-2-doug@schmorgal.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>