linux-kernel - [PATCH] mcb: Fix incorrect sanity check

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Message-ID: <20251120113732.24678-1-dev-josejavier.rodriguez@duagon.com>
Date: Thu, 20 Nov 2025 12:37:32 +0100
From: Jose Javier Rodriguez Barbarin <dev-josejavier.rodriguez@...gon.com>
To: morbidrsa@...il.com,
	gregkh@...uxfoundation.org
CC: linux-kernel@...r.kernel.org,
	Jose Javier Rodriguez Barbarin <dev-josejavier.rodriguez@...gon.com>
Subject: [PATCH] mcb: Fix incorrect sanity check

__mcb_register_driver() makes some sanity checks over mcb_driver
to check if .probe and .remove callbacks are set. However, not all
mcb device drivers implement .remove callback.

Remove .remove check to ensure all mcb device drivers can be loaded.

Signed-off-by: Jose Javier Rodriguez Barbarin <dev-josejavier.rodriguez@...gon.com>
---
 drivers/mcb/mcb-core.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index c1367223e71a..3d487d75c483 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -85,7 +85,8 @@ static void mcb_remove(struct device *dev)
 	struct mcb_device *mdev = to_mcb_device(dev);
 	struct module *carrier_mod;
 
-	mdrv->remove(mdev);
+	if (mdrv->remove)
+		mdrv->remove(mdev);
 
 	carrier_mod = mdev->dev.parent->driver->owner;
 	module_put(carrier_mod);
@@ -176,13 +177,13 @@ static const struct device_type mcb_carrier_device_type = {
  * @owner: The @mcb_driver's module
  * @mod_name: The name of the @mcb_driver's module
  *
- * Register a @mcb_driver at the system. Perform some sanity checks, if
- * the .probe and .remove methods are provided by the driver.
+ * Register a @mcb_driver at the system. Perform a sanity check, if
+ * .probe method is provided by the driver.
  */
 int __mcb_register_driver(struct mcb_driver *drv, struct module *owner,
 			const char *mod_name)
 {
-	if (!drv->probe || !drv->remove)
+	if (!drv->probe)
 		return -EINVAL;
 
 	drv->driver.owner = owner;
-- 
2.51.1