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atmel_serial: fix flow control bug

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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 <[email protected]>
Cc: "Andrew Victor" <[email protected]>
Cc: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Itai Levi 2009-01-15 13:50:43 -08:00 • committed by Linus Torvalds
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 */
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,
pdc->dma_addr,
pdc->dma_size,