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SubjectRe: [PATCH v2] serial: 8250_bcm7271: Save/restore RTS in suspend/resume
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On 29. 06. 22, 18:02, Florian Fainelli wrote:
> From: Doug Berger <opendmb@gmail.com>
>
> Commit 9cabe26e65a8 ("serial: 8250_bcm7271: UART errors after resuming
> from S2") prevented an early enabling of RTS during resume, but it did
> not actively restore the RTS state after resume.
>
> Fixes: 9cabe26e65a8 ("serial: 8250_bcm7271: UART errors after resuming from S2")
> Signed-off-by: Doug Berger <opendmb@gmail.com>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> drivers/tty/serial/8250/8250_bcm7271.c | 24 ++++++++++++++++++------
> 1 file changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
> index 9b878d023dac..b9cea38c8aff 100644
> --- a/drivers/tty/serial/8250/8250_bcm7271.c
> +++ b/drivers/tty/serial/8250/8250_bcm7271.c
...
> @@ -1180,7 +1184,15 @@ static int __maybe_unused brcmuart_resume(struct device *dev)
> start_rx_dma(serial8250_get_port(priv->line));
> }
> serial8250_resume_port(priv->line);
> - port->mctrl = priv->saved_mctrl;
> +
> + if (priv->saved_mctrl & TIOCM_RTS) {
> + /* Restore RTS */
> + spin_lock_irqsave(&port->lock, flags);
> + port->mctrl |= TIOCM_RTS;
> + spin_unlock_irqrestore(&port->lock, flags);
> + port->ops->set_mctrl(port, port->mctrl);

Calling ->set_mctrl w/o port->lock doesn't look really safe.

regards,
--
js
suse labs

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