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Revert "serial: core: only stop transmit when HW fifo is empty"

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commit c5603e2a62 upstream.

This reverts commit 7bfb915a59.

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>
This commit is contained in:
Doug Brown
2024-06-06 12:56:31 -07:00
committed by Greg Kroah-Hartman
parent 0bc1f7656a
commit fa42c4ec85
1 changed files with 1 additions and 2 deletions
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3
include/linux/serial_core.h
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@@ -789,8 +789,7 @@ enum UART_TX_FLAGS {
if (pending < WAKEUP_CHARS) { \
uart_write_wakeup(__port); \
\
if (!((flags) & UART_TX_NOSTOP) && pending == 0 && \
__port->ops->tx_empty(__port)) \
if (!((flags) & UART_TX_NOSTOP) && pending == 0) \
__port->ops->stop_tx(__port); \
} \
\