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serial: txx9: drop low-latency workaround 

Commit f5ee56cc18 ("[PATCH] txx9 serial update") worked around the
infamous low_latency behaviour of tty_flip_buffer_push() by simply
dropping and reacquiring the port lock in the interrupt handler.

Since commit a9c3f68f3c ("tty: Fix low_latency BUG"),
tty_flip_buffer_push() always schedules a work item to push data to the
line discipline and there's no need to keep any low_latency hacks around.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210421095509.3024-22-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-04-21 11:55:04 +02:00 committed by Greg Kroah-Hartman
parent f306226ee5
commit 38616c225e
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/serial_txx9.c
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@ -330,9 +330,9 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
up->port.ignore_status_mask = next_ignore_status_mask;
disr = sio_in(up, TXX9_SIDISR);
} while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
spin_unlock(&up->port.lock);
tty_flip_buffer_push(&up->port.state->port);
spin_lock(&up->port.lock);
*status = disr;
}