releases/6.12.7/ionic-no-double-destroy-workqueue.patch

From ef76e96a5e8b213bcf8941c179f6952165aab655 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Thu, 12 Dec 2024 13:31:56 -0800
Subject: ionic: no double destroy workqueue

From: Shannon Nelson <shannon.nelson@amd.com>

[ Upstream commit 746e6ae2e202b062b9deee7bd86d94937997ecd7 ]

There are some FW error handling paths that can cause us to
try to destroy the workqueue more than once, so let's be sure
we're checking for that.

The case where this popped up was in an AER event where the
handlers got called in such a way that ionic_reset_prepare()
and thus ionic_dev_teardown() got called twice in a row.
The second time through the workqueue was already destroyed,
and destroy_workqueue() choked on the bad wq pointer.

We didn't hit this in AER handler testing before because at
that time we weren't using a private workqueue.  Later we
replaced the use of the system workqueue with our own private
workqueue but hadn't rerun the AER handler testing since then.

Fixes: 9e25450da700 ("ionic: add private workqueue per-device")
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20241212213157.12212-3-shannon.nelson@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/pensando/ionic/ionic_dev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index 9e42d599840d..57edcde9e6f8 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -277,7 +277,10 @@ void ionic_dev_teardown(struct ionic *ionic)
 	idev->phy_cmb_pages = 0;
 	idev->cmb_npages = 0;
 
-	destroy_workqueue(ionic->wq);
+	if (ionic->wq) {
+		destroy_workqueue(ionic->wq);
+		ionic->wq = NULL;
+	}
 	mutex_destroy(&idev->cmb_inuse_lock);
 }
 
-- 
2.39.5