Commit 38616c22 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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serial: txx9: drop low-latency workaround 



Commit f5ee56cc ("[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 a9c3f68f ("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: default avatarJohan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210421095509.3024-22-johan@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f306226e

drivers/tty/serial/serial_txx9.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

}