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| author | Jeremy Kerr <jk@ozlabs.org> | 2018-03-27 11:48:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-23 10:16:50 +0200 |
| commit | ebbaf9ab9ebd69f42b286c7a67cc84571c3d947a (patch) | |
| tree | 188d96c0710790f69f68f79cf09c30bb9c1a720e /drivers/tty/serial | |
| parent | c5f78b1fe4e5baf4c4ca30377c2d7e06e2e391ec (diff) | |
| download | op-kernel-dev-ebbaf9ab9ebd69f42b286c7a67cc84571c3d947a.zip op-kernel-dev-ebbaf9ab9ebd69f42b286c7a67cc84571c3d947a.tar.gz | |
serial/8250: export serial8250_read_char
Currently, we export serial8250_rx_chars, which does a whole bunch of
reads from the 8250 data register, without any form of flow control
between reads.
An upcoming change to the aspeed vuart driver implements more
fine-grained flow control in the interrupt handler, requiring
character-at-a-time control over the rx path.
This change exports serial8250_read_char to allow this.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Tested-by: Eddie James <eajames@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 95833cb..8fbd5fb 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1680,7 +1680,7 @@ static void serial8250_enable_ms(struct uart_port *port) serial8250_rpm_put(up); } -static void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr) +void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr) { struct uart_port *port = &up->port; unsigned char ch; @@ -1740,6 +1740,7 @@ static void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr) uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); } +EXPORT_SYMBOL_GPL(serial8250_read_char); /* * serial8250_rx_chars: processes according to the passed in LSR |
