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Code Issues Releases Wiki Activity

tty: serial: atmel: Call dma_async_issue_pending()

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[ Upstream commit 4f4b9b5895 ]

The driver wrongly assummed that tx_submit() will start the transfer,
which is not the case, now that the at_xdmac driver is fixed. tx_submit
is supposed to push the current transaction descriptor to a pending queue,
waiting for issue_pending to be called. issue_pending must start the
transfer, not tx_submit.

Fixes: 34df42f59a ("serial: at91: add rx dma support")
Fixes: 08f738be88 ("serial: at91: add tx dma support")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211125090028.786832-4-tudor.ambarus@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tudor Ambarus 2021-11-25 11:00:18 +02:00 committed by Greg Kroah-Hartman
parent cd867ffa14
commit 62866d6542
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/atmel_serial.c
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@ -1007,6 +1007,8 @@ static void atmel_tx_dma(struct uart_port *port)
atmel_port->cookie_tx);
return;
}
dma_async_issue_pending(chan);
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@ -1273,6 +1275,8 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
goto chan_err;
}
dma_async_issue_pending(atmel_port->chan_rx);
return 0;
chan_err: