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serial: 8250: omap: Move pm_runtime_get_sync

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commit bcc7ba668818dcadd2f1db66b39ed860a63ecf97 upstream.

Currently in omap_8250_shutdown, the dma->rx_running flag is
set to zero in omap_8250_rx_dma_flush. Next pm_runtime_get_sync
is called, which is a runtime resume call stack which can
re-set the flag. When the call omap_8250_shutdown returns, the
flag is expected to be UN-SET, but this is not the case. This
is causing issues the next time UART is re-opened and
omap_8250_rx_dma is called. Fix by moving pm_runtime_get_sync
before the omap_8250_rx_dma_flush.

cc: stable@vger.kernel.org
Fixes: 0e31c8d173 ("tty: serial: 8250_omap: add custom DMA-RX callback")
Signed-off-by: Bin Liu <b-liu@ti.com>
[Judith: Add commit message]
Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20241031172315.453750-1-jm@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2024-10-31 12:23:15 -05:00 • committed by Greg Kroah-Hartman
parent 8d9d174d3f
commit 7b5e40abd1
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/8250/8250_omap.c
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@ -652,12 +652,12 @@ static void omap_8250_shutdown(struct uart_port *port)
struct uart_8250_port *up = up_to_u8250p(port);
struct omap8250_priv *priv = port->private_data;
pm_runtime_get_sync(port->dev);
flush_work(&priv->qos_work);
if (up->dma)
omap_8250_rx_dma_flush(up);
pm_runtime_get_sync(port->dev);
serial_out(up, UART_OMAP_WER, 0);
up->ier = 0;