From 7c07553807c5125c89de242d35c10c206fd8e6bb Mon Sep 17 00:00:00 2001
From: Chanh Nguyen <chanh@os.amperecomputing.com>
Date: Wed, 11 Jan 2023 13:51:05 +0700
Subject: [PATCH] USB: gadget: Add ID numbers to configfs-gadget driver names
Git-commit: 7c07553807c5125c89de242d35c10c206fd8e6bb
References: git-fixes
Patch-mainline: v6.2-rc5

It is unable to use configfs to attach more than one gadget. When
attaching the second gadget, it always fails and the kernel message
prints out:

Error: Driver 'configfs-gadget' is already registered, aborting...
UDC core: g1: driver registration failed: -16

This commit fixes the problem by using the gadget name as a suffix
to each configfs_gadget's driver name, thus making the names
distinct.

Fixes: fc274c1e9973 ("USB: gadget: Add a new bus for gadgets")
Cc: stable <stable@kernel.org>
Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Frank Li <frank.li@nxp.com>
Link: https://lore.kernel.org/r/20230111065105.29205-1-chanh@os.amperecomputing.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/gadget/configfs.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 96121d1c8df4..0853536cbf2e 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -393,6 +393,7 @@ static void gadget_info_attr_release(struct config_item *item)
 	WARN_ON(!list_empty(&gi->string_list));
 	WARN_ON(!list_empty(&gi->available_func));
 	kfree(gi->composite.gadget_driver.function);
+	kfree(gi->composite.gadget_driver.driver.name);
 	kfree(gi);
 }
 
@@ -1572,7 +1573,6 @@ static const struct usb_gadget_driver configfs_driver_template = {
 	.max_speed	= USB_SPEED_SUPER_PLUS,
 	.driver = {
 		.owner          = THIS_MODULE,
-		.name		= "configfs-gadget",
 	},
 	.match_existing_only = 1,
 };
@@ -1623,13 +1623,21 @@ static struct config_group *gadgets_make(
 
 	gi->composite.gadget_driver = configfs_driver_template;
 
+	gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
+							    "configfs-gadget.%s", name);
+	if (!gi->composite.gadget_driver.driver.name)
+		goto err;
+
 	gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
 	gi->composite.name = gi->composite.gadget_driver.function;
 
 	if (!gi->composite.gadget_driver.function)
-		goto err;
+		goto out_free_driver_name;
 
 	return &gi->group;
+
+out_free_driver_name:
+	kfree(gi->composite.gadget_driver.driver.name);
 err:
 	kfree(gi);
 	return ERR_PTR(-ENOMEM);
-- 
2.39.0