cros_ec: Fix deadlock when EC is not responsive at probe

When the EC is not responsive at probe, we try to get basic information
(protocol to use) later on through cros_xfer_cmd() call.
This patch makes sure there is no deadlock when re-probing the EC by
replacing call to cros_xfer_cmd() with send_command() in the function
cros_ec_get_host_command_version_mask(). Also, this patch adds the
function header indicating it must be called protected.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 8f57500..d6942a6 100644 (file)
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -235,6 +235,22 @@ static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev)
        return ret;
 }
 
+/*
+ * cros_ec_get_host_command_version_mask
+ *
+ * Get the version mask of a given command.
+ *
+ * @ec_dev: EC device to call
+ * @msg: message structure to use
+ * @cmd: command to get the version of.
+ * @mask: result when function returns 0.
+ *
+ * @return 0 on success, error code otherwise
+ *
+ * LOCKING:
+ * the caller has ec_dev->lock mutex or the caller knows there is
+ * no other command in progress.
+ */
 static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
        u16 cmd, u32 *mask)
 {
@@ -256,7 +272,7 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
        pver = (struct ec_params_get_cmd_versions *)msg->data;
        pver->cmd = cmd;
 
-       ret = cros_ec_cmd_xfer(ec_dev, msg);
+       ret = send_command(ec_dev, msg);
        if (ret > 0) {
                rver = (struct ec_response_get_cmd_versions *)msg->data;
                *mask = rver->version_mask;