On Mon, Jun 29, 2020 at 9:38 AM Prashant Malani <pmal...@chromium.org> wrote:
>
> Use a work queue to call the port update routines, instead of doing it
> directly in the PD notifier callback. This will prevent other drivers
> with PD notifier callbacks from being blocked on the port update routine
> completing.
>
> Signed-off-by: Prashant Malani <pmal...@chromium.org>
> ---
>
> Changes in v3:
> - Use new 100 character line length limit.
>
> Changes in v2:
> - No changes.
>
> drivers/platform/chrome/cros_ec_typec.c | 25 ++++++++++++++++++++-----
> 1 file changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_typec.c
> b/drivers/platform/chrome/cros_ec_typec.c
> index 0c041b79cbba..0beb62bf5adf 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -58,6 +58,7 @@ struct cros_typec_data {
> /* Array of ports, indexed by port number. */
> struct cros_typec_port *ports[EC_USB_PD_MAX_PORTS];
> struct notifier_block nb;
> + struct work_struct port_work;
> };
>
> static int cros_typec_parse_port_props(struct typec_capability *cap,
> @@ -619,18 +620,26 @@ static int cros_typec_get_cmd_version(struct
> cros_typec_data *typec)
> return 0;
> }
>
> -static int cros_ec_typec_event(struct notifier_block *nb,
> - unsigned long host_event, void *_notify)
> +static void cros_typec_port_work(struct work_struct *work)
> {
> - struct cros_typec_data *typec = container_of(nb, struct
> cros_typec_data,
> - nb);
> - int ret, i;
> + struct cros_typec_data *typec = container_of(work, struct
> cros_typec_data, port_work);
> + int ret;
> + int i;
>
I know I am getting picky here, but this seems like a personal
preference change. There is no "one variable declaration per line"
coding style rule.
> for (i = 0; i < typec->num_ports; i++) {
> ret = cros_typec_port_update(typec, i);
> if (ret < 0)
> dev_warn(typec->dev, "Update failed for port: %d\n",
> i);
> }
> +}
> +
> +
... but anyway, there should be no double empty lines.
> +static int cros_ec_typec_event(struct notifier_block *nb,
> + unsigned long host_event, void *_notify)
> +{
> + struct cros_typec_data *typec = container_of(nb, struct
> cros_typec_data, nb);
> +
> + schedule_work(&typec->port_work);
>
> return NOTIFY_OK;
> }
> @@ -689,6 +698,12 @@ static int cros_typec_probe(struct platform_device *pdev)
> if (ret < 0)
> return ret;
>
> + INIT_WORK(&typec->port_work, cros_typec_port_work);
> +
> + /*
> + * Safe to call port update here, since we haven't registered the
> + * PD notifier yet.
> + */
> for (i = 0; i < typec->num_ports; i++) {
> ret = cros_typec_port_update(typec, i);
> if (ret < 0)
> --
> 2.27.0.212.ge8ba1cc988-goog
>
