serial: 8250: Remove low_latency workaround
The defunct low_latency input steering executed flush_to_ldisc()
directly from interrupt context so dropping the port lock was
necessary to avoid deadlock. That steering was removed by
commit a9c3f68f3c
Author: Peter Hurley <peter@hurleysoftware.com>
Date: Sat Feb 22 07:31:21 2014 -0500
tty: Fix low_latency BUG
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
d22f8f1068
commit
6a597a38cb
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@ -1489,9 +1489,8 @@ unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
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break;
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lsr = serial_in(up, UART_LSR);
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} while (lsr & (UART_LSR_DR | UART_LSR_BI));
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spin_unlock(&port->lock);
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tty_flip_buffer_push(&port->state->port);
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spin_lock(&port->lock);
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return lsr;
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}
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EXPORT_SYMBOL_GPL(serial8250_rx_chars);
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