Messages in this thread | | | From | Guenter Roeck <> | Date | Mon, 29 Jun 2020 09:24:34 -0700 | Subject | Re: [PATCH v2 1/2] platform/chrome: cros_ec_typec: Use workqueue for port update |
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On Mon, Jun 29, 2020 at 9:13 AM Prashant Malani <pmalani@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 <pmalani@chromium.org> > --- > > Changes in v2: > - No changes. > > drivers/platform/chrome/cros_ec_typec.c | 28 ++++++++++++++++++++----- > 1 file changed, 23 insertions(+), 5 deletions(-) > > diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c > index 0c041b79cbba..630170fb2cbe 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 +620,29 @@ 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);
Nit, but the upstream line length limit is now 100 characters, and this is a perfect example where this would come handy.
> + int ret; > + int i; > > 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); > } > +} > + > + > +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); > + ... and even more so here.
> + schedule_work(&typec->port_work); > > return NOTIFY_OK; > } > @@ -689,6 +701,12 @@ 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 >
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