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platform/chrome: cros_ec_rpmsg: Fix race with host event

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Host event can be sent by remoteproc by any time, and
cros_ec_rpmsg_callback would be called after cros_ec_rpmsg_create_ept.
But the cros_ec_device is initialized after that, which cause host event
handler to use cros_ec_device that are not initialized properly yet.

Fix this by don't schedule host event handler before cros_ec_register
returns. Instead, remember that we have a pending host event, and
schedule host event handler after cros_ec_register.

Fixes: 71cddb7097e2 ("platform/chrome: cros_ec_rpmsg: Fix race with host command when probe failed.")
Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Pi-Hsun Shih 2020-02-14 16:26:38 +08:00 committed by Enric Balletbo i Serra
parent 42cd0ab476
commit f775ac78fc
1 changed files with 15 additions and 1 deletions
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16
drivers/platform/chrome/cros_ec_rpmsg.c
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@ -44,6 +44,8 @@ struct cros_ec_rpmsg {
struct completion xfer_ack;
struct work_struct host_event_work;
struct rpmsg_endpoint *ept;
bool has_pending_host_event;
bool probe_done;
};
/**
@ -177,7 +179,14 @@ static int cros_ec_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
memcpy(ec_dev->din, resp->data, len);
complete(&ec_rpmsg->xfer_ack);
} else if (resp->type == HOST_EVENT_MARK) {
schedule_work(&ec_rpmsg->host_event_work);
/*
* If the host event is sent before cros_ec_register is
* finished, queue the host event.
*/
if (ec_rpmsg->probe_done)
schedule_work(&ec_rpmsg->host_event_work);
else
ec_rpmsg->has_pending_host_event = true;
} else {
dev_warn(ec_dev->dev, "rpmsg received invalid type = %d",
resp->type);
@ -240,6 +249,11 @@ static int cros_ec_rpmsg_probe(struct rpmsg_device *rpdev)
return ret;
}
ec_rpmsg->probe_done = true;
if (ec_rpmsg->has_pending_host_event)
schedule_work(&ec_rpmsg->host_event_work);
return 0;
}