Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.4 80/84] platform/chrome: cros_ec_rpmsg: Fix race with host event | Date | Wed, 15 Apr 2020 07:44:37 -0400 |
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From: Pi-Hsun Shih <pihsun@chromium.org>
[ Upstream commit f775ac78fcfc6bdc96bdda07029d11f2a5e84869 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/platform/chrome/cros_ec_rpmsg.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_rpmsg.c b/drivers/platform/chrome/cros_ec_rpmsg.c index 0c3738c3244d8..aa2059b33ba56 100644 --- a/drivers/platform/chrome/cros_ec_rpmsg.c +++ b/drivers/platform/chrome/cros_ec_rpmsg.c @@ -42,6 +42,8 @@ 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; }; /** @@ -186,7 +188,14 @@ 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); @@ -249,6 +258,11 @@ 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; } -- 2.20.1
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