netdev - [PATCH v2 net-next 11/11] qede: make driver reliable on unload after failures

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Date:   Tue, 28 Jul 2020 11:58:59 +0300
From:   Igor Russkikh <irusskikh@...vell.com>
To:     <netdev@...r.kernel.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Ariel Elior <aelior@...vell.com>,
        Michal Kalderon <mkalderon@...vell.com>,
        Igor Russkikh <irusskikh@...vell.com>,
        "Alexander Lobakin" <alobakin@...vell.com>,
        Michal Kalderon <michal.kalderon@...vell.com>
Subject: [PATCH v2 net-next 11/11] qede: make driver reliable on unload after failures

First, we check cdev for null on dev close. That could be a case
if recovery was not successful.

Next, we nullify cdev if something bad happens on recovery, to
not to access freed memory accidentially.

Signed-off-by: Igor Russkikh <irusskikh@...vell.com>
Signed-off-by: Alexander Lobakin <alobakin@...vell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@...vell.com>
---
 drivers/net/ethernet/qlogic/qede/qede_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 937d8e69ad39..03b0c943b759 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -1244,6 +1244,7 @@ static int __qede_probe(struct pci_dev *pdev, u32 dp_module, u8 dp_level,
 	qed_ops->common->slowpath_stop(cdev);
 err1:
 	qed_ops->common->remove(cdev);
+	edev->cdev = NULL;
 err0:
 	return rc;
 }
@@ -2474,7 +2475,8 @@ static int qede_close(struct net_device *ndev)
 
 	qede_unload(edev, QEDE_UNLOAD_NORMAL, false);
 
-	edev->ops->common->update_drv_state(edev->cdev, false);
+	if (edev->cdev)
+		edev->ops->common->update_drv_state(edev->cdev, false);
 
 	return 0;
 }
-- 
2.17.1