linux-kernel - [PATCH] fsi: Fix error handling in fsi_master

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Message-Id: <f37bfdccfcf8a8d1bdcbf668b802df13253ed3fe.1650556911.git.christophe.jaillet@wanadoo.fr>
Date:   Thu, 21 Apr 2022 18:02:15 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jeremy Kerr <jk@...abs.org>, Joel Stanley <joel@....id.au>,
        Alistar Popple <alistair@...ple.id.au>,
        Eddie James <eajames@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-fsi@...ts.ozlabs.org
Subject: [PATCH] fsi: Fix error handling in fsi_master_register() and its callers

fsi_master_register() calls device_register().
When device_register() fails, put_device() still needs to be called.

Up to now, there is no put_device() in fsi_master_register().
Some callers of fsi_master_register() have it, some have not.
 - fsi_master_acf_probe() call put_device() if fsi_master_register() fails
 - fsi_master_gpio_probe() call put_device() if fsi_master_register() fails
 - fsi_master_aspeed_probe() doesn't
 - hub_master_probe() doesn't

In order to fix it and be consistent with the different callers, add the
missing put_device() in the error handling path of fsi_master_register()
and remove it from 2 callers that were handling it by themselves.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This patch is speculative and compile tested only.
Review with care.

Another alternative would be to add the put_device() call in
fsi_master_aspeed_probe() and hub_master_probe() if it makes more sense.

Having one or more Fixes tag is a bit hard because of the relations and
log history of the 5 files involved in this bug fix.
---
 drivers/fsi/fsi-core.c          | 1 +
 drivers/fsi/fsi-master-ast-cf.c | 1 -
 drivers/fsi/fsi-master-gpio.c   | 1 -
 3 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 3a7b78e36701..640692e5400f 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1319,6 +1319,7 @@ int fsi_master_register(struct fsi_master *master)
 
 	rc = device_register(&master->dev);
 	if (rc) {
+		put_device(&master->dev);
 		ida_simple_remove(&master_ida, master->idx);
 		return rc;
 	}
diff --git a/drivers/fsi/fsi-master-ast-cf.c b/drivers/fsi/fsi-master-ast-cf.c
index 24292acdbaf8..dde63d703ea1 100644
--- a/drivers/fsi/fsi-master-ast-cf.c
+++ b/drivers/fsi/fsi-master-ast-cf.c
@@ -1395,7 +1395,6 @@ static int fsi_master_acf_probe(struct platform_device *pdev)
 		return 0;
 
 	device_remove_file(master->dev, &dev_attr_external_mode);
-	put_device(&master->master.dev);
 	return rc;
 
  stop_copro:
diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index 7d5f29b4b595..1ae3c164d7fd 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -856,7 +856,6 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
 	rc = fsi_master_register(&master->master);
 	if (rc) {
 		device_remove_file(&pdev->dev, &dev_attr_external_mode);
-		put_device(&master->master.dev);
 		return rc;
 	}
 	return 0;
-- 
2.32.0