From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Fri, 8 Jan 2021 11:07:24 +0200
Subject: bus: fsl-mc: return -EPROBE_DEFER when a device is not yet discovered

Git-commit: ef57e6c9f7d988c550111d73fe337211da3d5100
Patch-mainline: v5.12-rc1
References: jsc#SLE-12251

The fsl_mc_get_endpoint() should return a pointer to the connected
fsl_mc device, if there is one. By interrogating the MC firmware, we
know if there is an endpoint or not so when the endpoint device is
actually searched on the fsl-mc bus and not found we are hitting the
case in which the device has not been yet discovered by the bus.

Return -EPROBE_DEFER so that callers can differentiate this case.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index b8e6acdf932e..8af978bd0000 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -840,6 +840,15 @@ struct fsl_mc_device *fsl_mc_get_endpoint(struct fsl_mc_device *mc_dev)
 	endpoint_desc.id = endpoint2.id;
 	endpoint = fsl_mc_device_lookup(&endpoint_desc, mc_bus_dev);
 
+	/*
+	 * We know that the device has an endpoint because we verified by
+	 * interrogating the firmware. This is the case when the device was not
+	 * yet discovered by the fsl-mc bus, thus the lookup returned NULL.
+	 * Differentiate this case by returning EPROBE_DEFER.
+	 */
+	if (!endpoint)
+		return ERR_PTR(-EPROBE_DEFER);
+
 	return endpoint;
 }
 EXPORT_SYMBOL_GPL(fsl_mc_get_endpoint);
-- 
2.26.2