From: Slawomir Laba <slawomirx.laba@intel.com>
Date: Thu, 3 Nov 2022 14:00:03 +0100
Subject: iavf: Fix race condition between iavf_shutdown and iavf_remove
Patch-mainline: v6.1-rc7
Git-commit: a8417330f8a57275ed934293e832982b6d882713
References: jsc#PED-835

Fix a deadlock introduced by commit
974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
due to race condition between iavf_shutdown and iavf_remove, where
iavf_remove stucks forever in while loop since iavf_shutdown already
set __IAVF_REMOVE adapter state.

Fix this by checking if the __IAVF_IN_REMOVE_TASK has already been
set and return if so.

Fixes: 974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -5042,23 +5042,21 @@ static int __maybe_unused iavf_resume(st
 static void iavf_remove(struct pci_dev *pdev)
 {
 	struct iavf_adapter *adapter = iavf_pdev_to_adapter(pdev);
-	struct net_device *netdev = adapter->netdev;
 	struct iavf_fdir_fltr *fdir, *fdirtmp;
 	struct iavf_vlan_filter *vlf, *vlftmp;
+	struct iavf_cloud_filter *cf, *cftmp;
 	struct iavf_adv_rss *rss, *rsstmp;
 	struct iavf_mac_filter *f, *ftmp;
-	struct iavf_cloud_filter *cf, *cftmp;
-	struct iavf_hw *hw = &adapter->hw;
+	struct net_device *netdev;
+	struct iavf_hw *hw;
 	int err;
 
-	/* When reboot/shutdown is in progress no need to do anything
-	 * as the adapter is already REMOVE state that was set during
-	 * iavf_shutdown() callback.
-	 */
-	if (adapter->state == __IAVF_REMOVE)
+	netdev = adapter->netdev;
+	hw = &adapter->hw;
+
+	if (test_and_set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
 		return;
 
-	set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
 	/* Wait until port initialization is complete.
 	 * There are flows where register/unregister netdev may race.
 	 */