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ARM: meson: serial: check for tx-irq enabled in irq code

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Ensure that if the interrupt handler is entered then only try and do tx
work if the tx irq is enabled.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Dooks 2015-11-18 14:41:19 +00:00 committed by Greg Kroah-Hartman
parent f1dd05c829
commit 39469654db
1 changed files with 4 additions and 2 deletions
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6
drivers/tty/serial/meson_uart.c
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@ -237,8 +237,10 @@ static irqreturn_t meson_uart_interrupt(int irq, void *dev_id)
if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY))
meson_receive_chars(port);
if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL))
meson_uart_start_tx(port);
if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {
if (readl(port->membase + AML_UART_CONTROL) & AML_UART_TX_INT_EN)
meson_uart_start_tx(port);
}
spin_unlock(&port->lock);