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atmel_serial: fix flow control bug 

Fix the following problem, related to hardware flow control (CTS/RTS):
Transmitting while CTS line is asserted in DMA mode, due to not checking
for tx-stopped condition.

We found these problems while testing the UARTs with hardware
flow-control.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: "Andrew Victor" <avictor.za@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Itai Levi 2009-01-15 13:50:43 -08:00 committed by Linus Torvalds
parent db0fb1848a
commit 1f14081d8b
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/atmel_serial.c
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@ -579,7 +579,7 @@ static void atmel_tx_dma(struct uart_port *port)
/* disable PDC transmit */ /* disable PDC transmit */
UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS); UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
if (!uart_circ_empty(xmit)) { if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
dma_sync_single_for_device(port->dev, dma_sync_single_for_device(port->dev,
pdc->dma_addr, pdc->dma_addr,
pdc->dma_size, pdc->dma_size,