linux-kernel - [PATCH 1/2] bus: fsl-mc: Drop if block with always false condition

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Message-ID: <20231103230001.3652259-3-u.kleine-koenig@pengutronix.de>
Date:   Sat,  4 Nov 2023 00:00:02 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH 1/2] bus: fsl-mc:  Drop if block with always false condition

The mc that belongs to a pdev is always a root dprc. In
fsl_mc_bus_probe() the mc device gets assigned the platform device as
parent. As dev_is_fsl_mc() is false for a platform device,
fsl_mc_get_root_dprc() will always be true and so the if body is never
run and it can be dropped.

The motivation for this change is to get rid of an error path in
.remove() that is broken (because only a part of the necessary cleanup
is done resulting in leaks and/or use-after-frees and the driver core
ignores the return value of .remove().)

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 2f6d5002e43d..75a8d365ffd4 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1172,9 +1172,6 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
 	struct fsl_mc_io *mc_io;
 
-	if (!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev))
-		return -EINVAL;
-
 	mc_io = mc->root_mc_bus_dev->mc_io;
 	fsl_mc_device_remove(mc->root_mc_bus_dev);
 	fsl_destroy_mc_io(mc_io);

base-commit: e27090b1413ff236ca1aec26d6b022149115de2c
-- 
2.42.0