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imx: serial: notify higher layers in case xmit IRQ was not called 

upper layers, namely line discipline, need to be notified
when transmission of more data is possible. For spurious
cases, where IRQ handling does not supply notification
for sure, it is given additionally here, when data has just
been transmitted and space in the buffer will most probably
be available.

Signed-off-by: Fabian Godehardt <fg@emlix.com>
Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fabian Godehardt 2009-06-11 14:37:19 +01:00 committed by Linus Torvalds
parent 26bbb3ff1f
commit 977757311e
1 changed files with 3 additions and 0 deletions
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3
drivers/serial/imx.c
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@ -308,6 +308,9 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (uart_circ_empty(xmit))
imx_stop_tx(&sport->port);
}