netdev - [PATCH 2/2] isdn: mISDN: netjet: fix wrong check of device registration

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Message-ID: <20221031121341.1293978-3-yangyingliang@huawei.com>
Date:   Mon, 31 Oct 2022 20:13:41 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <netdev@...r.kernel.org>
CC:     <isdn@...ux-pingi.de>, <davem@...emloft.net>
Subject: [PATCH 2/2] isdn: mISDN: netjet: fix wrong check of device registration

The class is set in mISDN_register_device(), but if device_add() returns
error, it will lead to delete a device without added, fix this by using
device_is_registered() to check if the device is registered.

Fixes: a900845e5661 ("mISDN: Add support for Traverse Technologies NETJet PCI cards")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/isdn/hardware/mISDN/netjet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c
index a52f275f8263..f8447135a902 100644
--- a/drivers/isdn/hardware/mISDN/netjet.c
+++ b/drivers/isdn/hardware/mISDN/netjet.c
@@ -956,7 +956,7 @@ nj_release(struct tiger_hw *card)
 	}
 	if (card->irq > 0)
 		free_irq(card->irq, card);
-	if (card->isac.dch.dev.dev.class)
+	if (device_is_registered(&card->isac.dch.dev.dev))
 		mISDN_unregister_device(&card->isac.dch.dev);
 
 	for (i = 0; i < 2; i++) {
-- 
2.25.1