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author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2021-11-25 10:00:18 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 16:26:37 +0100 |
commit | 4f4b9b5895614eb2e2b5f4cab7858f44bd113e1b (patch) | |
tree | fc3504fa0a615219825b36a16919d6cd691fc21a /drivers/tty/serial/atmel_serial.c | |
parent | tty: serial: atmel: Check return code of dmaengine_submit() (diff) | |
download | linux-4f4b9b5895614eb2e2b5f4cab7858f44bd113e1b.tar.xz linux-4f4b9b5895614eb2e2b5f4cab7858f44bd113e1b.zip |
tty: serial: atmel: Call dma_async_issue_pending()
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: 34df42f59a60 ("serial: at91: add rx dma support")
Fixes: 08f738be88bb ("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>
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
-rw-r--r-- | drivers/tty/serial/atmel_serial.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 376f7a9c2868..269b4500e9e7 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1009,6 +1009,8 @@ 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) @@ -1269,6 +1271,8 @@ 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: |