[Intel-wired-lan] [PATCH AUTOSEL 5.13 019/219] iavf: do not override the adapter state in the watchdog task

[Intel-wired-lan] [PATCH AUTOSEL 5.13 019/219] iavf: do not override the adapter state in the watchdog task

[Sasha Levin]

From: Stefan Assmann <sassmann@kpanic.de>

[ Upstream commit 22c8fd71d3a5e6fe584ccc2c1e8760e5baefd5aa ]

The iavf watchdog task overrides adapter->state to __IAVF_RESETTING
when it detects a pending reset. Then schedules iavf_reset_task() which
takes care of the reset.

The reset task is capable of handling the reset without changing
adapter->state. In fact we lose the state information when the watchdog
task prematurely changes the adapter state. This may lead to a crash if
instead of the reset task the iavf_remove() function gets called before
the reset task.
In that case (if we were in state __IAVF_RUNNING previously) the
iavf_remove() function triggers iavf_close() which fails to close the
device because of the incorrect state information.

This may result in a crash due to pending interrupts.
kernel BUG at drivers/pci/msi.c:357!
[...]
Call Trace:
 [<ffffffffbddf24dd>] pci_disable_msix+0x3d/0x50
 [<ffffffffc08d2a63>] iavf_reset_interrupt_capability+0x23/0x40 [iavf]
 [<ffffffffc08d312a>] iavf_remove+0x10a/0x350 [iavf]
 [<ffffffffbddd3359>] pci_device_remove+0x39/0xc0
 [<ffffffffbdeb492f>] __device_release_driver+0x7f/0xf0
 [<ffffffffbdeb49c3>] device_release_driver+0x23/0x30
 [<ffffffffbddcabb4>] pci_stop_bus_device+0x84/0xa0
 [<ffffffffbddcacc2>] pci_stop_and_remove_bus_device+0x12/0x20
 [<ffffffffbddf361f>] pci_iov_remove_virtfn+0xaf/0x160
 [<ffffffffbddf3bcc>] sriov_disable+0x3c/0xf0
 [<ffffffffbddf3ca3>] pci_disable_sriov+0x23/0x30
 [<ffffffffc0667365>] i40e_free_vfs+0x265/0x2d0 [i40e]
 [<ffffffffc0667624>] i40e_pci_sriov_configure+0x144/0x1f0 [i40e]
 [<ffffffffbddd5307>] sriov_numvfs_store+0x177/0x1d0
Code: 00 00 e8 3c 25 e3 ff 49 c7 86 88 08 00 00 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 8b 7b 28 e8 0d 44
RIP  [<ffffffffbbbf1068>] free_msi_irqs+0x188/0x190

The solution is to not touch the adapter->state in iavf_watchdog_task()
and let the reset task handle the state transition.

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 606a01ce4073..0d0f16617dde 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -1984,7 +1984,6 @@ static void iavf_watchdog_task(struct work_struct *work)
 		/* check for hw reset */
 	reg_val = rd32(hw, IAVF_VF_ARQLEN1) & IAVF_VF_ARQLEN1_ARQENABLE_MASK;
 	if (!reg_val) {
-		adapter->state = __IAVF_RESETTING;
 		adapter->flags |= IAVF_FLAG_RESET_PENDING;
 		adapter->aq_required = 0;
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
-- 
2.30.2

[Intel-wired-lan] [PATCH AUTOSEL 5.13 020/219] iavf: fix locking of critical sections

[Sasha Levin]

From: Stefan Assmann <sassmann@kpanic.de>

[ Upstream commit 226d528512cfac890a1619aea4301f3dd314fe60 ]

To avoid races between iavf_init_task(), iavf_reset_task(),
iavf_watchdog_task(), iavf_adminq_task() as well as the shutdown and
remove functions more locking is required.
The current protection by __IAVF_IN_CRITICAL_TASK is needed in
additional places.

- The reset task performs state transitions, therefore needs locking.
- The adminq task acts on replies from the PF in
  iavf_virtchnl_completion() which may alter the states.
- The init task is not only run during probe but also if a VF gets stuck
  to reinitialize it.
- The shutdown function performs a state transition.
- The remove function performs a state transition and also free's
  resources.

iavf_lock_timeout() is introduced to avoid waiting infinitely
and cause a deadlock. Rather unlock and print a warning.

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 57 ++++++++++++++++++---
 1 file changed, 50 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 0d0f16617dde..e5e6a5b11e6d 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -131,6 +131,30 @@ enum iavf_status iavf_free_virt_mem_d(struct iavf_hw *hw,
 	return 0;
 }
 
+/**
+ * iavf_lock_timeout - try to set bit but give up after timeout
+ * @adapter: board private structure
+ * @bit: bit to set
+ * @msecs: timeout in msecs
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int iavf_lock_timeout(struct iavf_adapter *adapter,
+			     enum iavf_critical_section_t bit,
+			     unsigned int msecs)
+{
+	unsigned int wait, delay = 10;
+
+	for (wait = 0; wait < msecs; wait += delay) {
+		if (!test_and_set_bit(bit, &adapter->crit_section))
+			return 0;
+
+		msleep(delay);
+	}
+
+	return -1;
+}
+
 /**
  * iavf_schedule_reset - Set the flags and schedule a reset event
  * @adapter: board private structure
@@ -2097,6 +2121,10 @@ static void iavf_reset_task(struct work_struct *work)
 	if (test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
 		return;
 
+	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 200)) {
+		schedule_work(&adapter->reset_task);
+		return;
+	}
 	while (test_and_set_bit(__IAVF_IN_CLIENT_TASK,
 				&adapter->crit_section))
 		usleep_range(500, 1000);
@@ -2311,6 +2339,8 @@ static void iavf_adminq_task(struct work_struct *work)
 	if (!event.msg_buf)
 		goto out;
 
+	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 200))
+		goto freedom;
 	do {
 		ret = iavf_clean_arq_element(hw, &event, &pending);
 		v_op = (enum virtchnl_ops)le32_to_cpu(event.desc.cookie_high);
@@ -2324,6 +2354,7 @@ static void iavf_adminq_task(struct work_struct *work)
 		if (pending != 0)
 			memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE);
 	} while (pending);
+	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
 
 	if ((adapter->flags &
 	     (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) ||
@@ -3628,6 +3659,10 @@ static void iavf_init_task(struct work_struct *work)
 						    init_task.work);
 	struct iavf_hw *hw = &adapter->hw;
 
+	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000)) {
+		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
+		return;
+	}
 	switch (adapter->state) {
 	case __IAVF_STARTUP:
 		if (iavf_startup(adapter) < 0)
@@ -3640,14 +3675,14 @@ static void iavf_init_task(struct work_struct *work)
 	case __IAVF_INIT_GET_RESOURCES:
 		if (iavf_init_get_resources(adapter) < 0)
 			goto init_failed;
-		return;
+		goto out;
 	default:
 		goto init_failed;
 	}
 
 	queue_delayed_work(iavf_wq, &adapter->init_task,
 			   msecs_to_jiffies(30));
-	return;
+	goto out;
 init_failed:
 	if (++adapter->aq_wait_count > IAVF_AQ_MAX_ERR) {
 		dev_err(&adapter->pdev->dev,
@@ -3656,9 +3691,11 @@ static void iavf_init_task(struct work_struct *work)
 		iavf_shutdown_adminq(hw);
 		adapter->state = __IAVF_STARTUP;
 		queue_delayed_work(iavf_wq, &adapter->init_task, HZ * 5);
-		return;
+		goto out;
 	}
 	queue_delayed_work(iavf_wq, &adapter->init_task, HZ);
+out:
+	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
 }
 
 /**
@@ -3675,9 +3712,12 @@ static void iavf_shutdown(struct pci_dev *pdev)
 	if (netif_running(netdev))
 		iavf_close(netdev);
 
+	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000))
+		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
 	/* Prevent the watchdog from running. */
 	adapter->state = __IAVF_REMOVE;
 	adapter->aq_required = 0;
+	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
 
 #ifdef CONFIG_PM
 	pci_save_state(pdev);
@@ -3911,10 +3951,6 @@ static void iavf_remove(struct pci_dev *pdev)
 				 err);
 	}
 
-	/* Shut down all the garbage mashers on the detention level */
-	adapter->state = __IAVF_REMOVE;
-	adapter->aq_required = 0;
-	adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
 	iavf_request_reset(adapter);
 	msleep(50);
 	/* If the FW isn't responding, kick it once, but only once. */
@@ -3922,6 +3958,13 @@ static void iavf_remove(struct pci_dev *pdev)
 		iavf_request_reset(adapter);
 		msleep(50);
 	}
+	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000))
+		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
+
+	/* Shut down all the garbage mashers on the detention level */
+	adapter->state = __IAVF_REMOVE;
+	adapter->aq_required = 0;
+	adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
 	iavf_free_all_tx_resources(adapter);
 	iavf_free_all_rx_resources(adapter);
 	iavf_misc_irq_disable(adapter);
-- 
2.30.2

[Intel-wired-lan] [PATCH AUTOSEL 5.13 031/219] igc: Check if num of q_vectors is smaller than max before array access

[Sasha Levin]

From: Sasha Neftin <sasha.neftin@intel.com>

[ Upstream commit 373e2829e7c2e1e606503cdb5c97749f512a4be9 ]

Ensure that the adapter->q_vector[MAX_Q_VECTORS] array isn't accessed
beyond its size. It was fixed by using a local variable num_q_vectors
as a limit for loop index, and ensure that num_q_vectors is not bigger
than MAX_Q_VECTORS.

Suggested-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 9b85fdf01297..3e301c5c5270 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -4402,6 +4402,7 @@ static irqreturn_t igc_msix_ring(int irq, void *data)
  */
 static int igc_request_msix(struct igc_adapter *adapter)
 {
+	unsigned int num_q_vectors = adapter->num_q_vectors;
 	int i = 0, err = 0, vector = 0, free_vector = 0;
 	struct net_device *netdev = adapter->netdev;
 
@@ -4410,7 +4411,13 @@ static int igc_request_msix(struct igc_adapter *adapter)
 	if (err)
 		goto err_out;
 
-	for (i = 0; i < adapter->num_q_vectors; i++) {
+	if (num_q_vectors > MAX_Q_VECTORS) {
+		num_q_vectors = MAX_Q_VECTORS;
+		dev_warn(&adapter->pdev->dev,
+			 "The number of queue vectors (%d) is higher than max allowed (%d)\n",
+			 adapter->num_q_vectors, MAX_Q_VECTORS);
+	}
+	for (i = 0; i < num_q_vectors; i++) {
 		struct igc_q_vector *q_vector = adapter->q_vector[i];
 
 		vector++;
-- 
2.30.2

[Intel-wired-lan] [PATCH AUTOSEL 5.13 149/219] iavf: use mutexes for locking of critical sections

[Sasha Levin]

From: Stefan Assmann <sassmann@kpanic.de>

[ Upstream commit 5ac49f3c2702f269d31cc37eb9308bc557953c4d ]

As follow-up to the discussion with Jakub Kicinski about iavf locking
being insufficient [1] convert iavf to use mutexes instead of bitops.
The locking logic is kept as is, just a drop-in replacement of
enum iavf_critical_section_t with separate mutexes.
The only difference is that the mutexes will be destroyed before the
module is unloaded.

[1] https://lwn.net/ml/netdev/20210316150210.00007249%40intel.com/

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/intel/iavf/iavf.h        |   9 +-
 .../net/ethernet/intel/iavf/iavf_ethtool.c    |  10 +-
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 100 +++++++++---------
 3 files changed, 56 insertions(+), 63 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 90793b36126e..68c80f04113c 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -186,12 +186,6 @@ enum iavf_state_t {
 	__IAVF_RUNNING,		/* opened, working */
 };
 
-enum iavf_critical_section_t {
-	__IAVF_IN_CRITICAL_TASK,	/* cannot be interrupted */
-	__IAVF_IN_CLIENT_TASK,
-	__IAVF_IN_REMOVE_TASK,	/* device being removed */
-};
-
 #define IAVF_CLOUD_FIELD_OMAC		0x01
 #define IAVF_CLOUD_FIELD_IMAC		0x02
 #define IAVF_CLOUD_FIELD_IVLAN	0x04
@@ -236,6 +230,9 @@ struct iavf_adapter {
 	struct iavf_q_vector *q_vectors;
 	struct list_head vlan_filter_list;
 	struct list_head mac_filter_list;
+	struct mutex crit_lock;
+	struct mutex client_lock;
+	struct mutex remove_lock;
 	/* Lock to protect accesses to MAC and VLAN lists */
 	spinlock_t mac_vlan_list_lock;
 	char misc_vector_name[IFNAMSIZ + 9];
diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index af43fbd8cb75..edbeb27213f8 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -1352,8 +1352,7 @@ static int iavf_add_fdir_ethtool(struct iavf_adapter *adapter, struct ethtool_rx
 	if (!fltr)
 		return -ENOMEM;
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section)) {
+	while (!mutex_trylock(&adapter->crit_lock)) {
 		if (--count == 0) {
 			kfree(fltr);
 			return -EINVAL;
@@ -1378,7 +1377,7 @@ static int iavf_add_fdir_ethtool(struct iavf_adapter *adapter, struct ethtool_rx
 	if (err && fltr)
 		kfree(fltr);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 	return err;
 }
 
@@ -1563,8 +1562,7 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 		return -EINVAL;
 	}
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section)) {
+	while (!mutex_trylock(&adapter->crit_lock)) {
 		if (--count == 0) {
 			kfree(rss_new);
 			return -EINVAL;
@@ -1600,7 +1598,7 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 	if (!err)
 		mod_delayed_work(iavf_wq, &adapter->watchdog_task, 0);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	if (!rss_new_add)
 		kfree(rss_new);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index e5e6a5b11e6d..23762a7ef740 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -132,21 +132,18 @@ enum iavf_status iavf_free_virt_mem_d(struct iavf_hw *hw,
 }
 
 /**
- * iavf_lock_timeout - try to set bit but give up after timeout
- * @adapter: board private structure
- * @bit: bit to set
+ * iavf_lock_timeout - try to lock mutex but give up after timeout
+ * @lock: mutex that should be locked
  * @msecs: timeout in msecs
  *
  * Returns 0 on success, negative on failure
  **/
-static int iavf_lock_timeout(struct iavf_adapter *adapter,
-			     enum iavf_critical_section_t bit,
-			     unsigned int msecs)
+static int iavf_lock_timeout(struct mutex *lock, unsigned int msecs)
 {
 	unsigned int wait, delay = 10;
 
 	for (wait = 0; wait < msecs; wait += delay) {
-		if (!test_and_set_bit(bit, &adapter->crit_section))
+		if (mutex_trylock(lock))
 			return 0;
 
 		msleep(delay);
@@ -1940,7 +1937,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 	struct iavf_hw *hw = &adapter->hw;
 	u32 reg_val;
 
-	if (test_and_set_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section))
+	if (!mutex_trylock(&adapter->crit_lock))
 		goto restart_watchdog;
 
 	if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
@@ -1958,8 +1955,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 			adapter->state = __IAVF_STARTUP;
 			adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
 			queue_delayed_work(iavf_wq, &adapter->init_task, 10);
-			clear_bit(__IAVF_IN_CRITICAL_TASK,
-				  &adapter->crit_section);
+			mutex_unlock(&adapter->crit_lock);
 			/* Don't reschedule the watchdog, since we've restarted
 			 * the init task. When init_task contacts the PF and
 			 * gets everything set up again, it'll restart the
@@ -1969,14 +1965,13 @@ static void iavf_watchdog_task(struct work_struct *work)
 		}
 		adapter->aq_required = 0;
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
-		clear_bit(__IAVF_IN_CRITICAL_TASK,
-			  &adapter->crit_section);
+		mutex_unlock(&adapter->crit_lock);
 		queue_delayed_work(iavf_wq,
 				   &adapter->watchdog_task,
 				   msecs_to_jiffies(10));
 		goto watchdog_done;
 	case __IAVF_RESETTING:
-		clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+		mutex_unlock(&adapter->crit_lock);
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2);
 		return;
 	case __IAVF_DOWN:
@@ -1999,7 +1994,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 		}
 		break;
 	case __IAVF_REMOVE:
-		clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+		mutex_unlock(&adapter->crit_lock);
 		return;
 	default:
 		goto restart_watchdog;
@@ -2021,7 +2016,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 	if (adapter->state == __IAVF_RUNNING ||
 	    adapter->state == __IAVF_COMM_FAILED)
 		iavf_detect_recover_hung(&adapter->vsi);
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 restart_watchdog:
 	if (adapter->aq_required)
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
@@ -2085,7 +2080,7 @@ static void iavf_disable_vf(struct iavf_adapter *adapter)
 	memset(adapter->vf_res, 0, IAVF_VIRTCHNL_VF_RESOURCE_SIZE);
 	iavf_shutdown_adminq(&adapter->hw);
 	adapter->netdev->flags &= ~IFF_UP;
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 	adapter->flags &= ~IAVF_FLAG_RESET_PENDING;
 	adapter->state = __IAVF_DOWN;
 	wake_up(&adapter->down_waitqueue);
@@ -2118,15 +2113,14 @@ static void iavf_reset_task(struct work_struct *work)
 	/* When device is being removed it doesn't make sense to run the reset
 	 * task, just return in such a case.
 	 */
-	if (test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
+	if (mutex_is_locked(&adapter->remove_lock))
 		return;
 
-	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 200)) {
+	if (iavf_lock_timeout(&adapter->crit_lock, 200)) {
 		schedule_work(&adapter->reset_task);
 		return;
 	}
-	while (test_and_set_bit(__IAVF_IN_CLIENT_TASK,
-				&adapter->crit_section))
+	while (!mutex_trylock(&adapter->client_lock))
 		usleep_range(500, 1000);
 	if (CLIENT_ENABLED(adapter)) {
 		adapter->flags &= ~(IAVF_FLAG_CLIENT_NEEDS_OPEN |
@@ -2178,7 +2172,7 @@ static void iavf_reset_task(struct work_struct *work)
 		dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
 			reg_val);
 		iavf_disable_vf(adapter);
-		clear_bit(__IAVF_IN_CLIENT_TASK, &adapter->crit_section);
+		mutex_unlock(&adapter->client_lock);
 		return; /* Do not attempt to reinit. It's dead, Jim. */
 	}
 
@@ -2305,13 +2299,13 @@ static void iavf_reset_task(struct work_struct *work)
 		adapter->state = __IAVF_DOWN;
 		wake_up(&adapter->down_waitqueue);
 	}
-	clear_bit(__IAVF_IN_CLIENT_TASK, &adapter->crit_section);
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->client_lock);
+	mutex_unlock(&adapter->crit_lock);
 
 	return;
 reset_err:
-	clear_bit(__IAVF_IN_CLIENT_TASK, &adapter->crit_section);
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->client_lock);
+	mutex_unlock(&adapter->crit_lock);
 	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
 	iavf_close(netdev);
 }
@@ -2339,7 +2333,7 @@ static void iavf_adminq_task(struct work_struct *work)
 	if (!event.msg_buf)
 		goto out;
 
-	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 200))
+	if (iavf_lock_timeout(&adapter->crit_lock, 200))
 		goto freedom;
 	do {
 		ret = iavf_clean_arq_element(hw, &event, &pending);
@@ -2354,7 +2348,7 @@ static void iavf_adminq_task(struct work_struct *work)
 		if (pending != 0)
 			memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE);
 	} while (pending);
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	if ((adapter->flags &
 	     (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) ||
@@ -2421,7 +2415,7 @@ static void iavf_client_task(struct work_struct *work)
 	 * later.
 	 */
 
-	if (test_and_set_bit(__IAVF_IN_CLIENT_TASK, &adapter->crit_section))
+	if (!mutex_trylock(&adapter->client_lock))
 		return;
 
 	if (adapter->flags & IAVF_FLAG_SERVICE_CLIENT_REQUESTED) {
@@ -2444,7 +2438,7 @@ static void iavf_client_task(struct work_struct *work)
 		adapter->flags &= ~IAVF_FLAG_CLIENT_NEEDS_OPEN;
 	}
 out:
-	clear_bit(__IAVF_IN_CLIENT_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->client_lock);
 }
 
 /**
@@ -3047,8 +3041,7 @@ static int iavf_configure_clsflower(struct iavf_adapter *adapter,
 	if (!filter)
 		return -ENOMEM;
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section)) {
+	while (!mutex_trylock(&adapter->crit_lock)) {
 		if (--count == 0)
 			goto err;
 		udelay(1);
@@ -3079,7 +3072,7 @@ static int iavf_configure_clsflower(struct iavf_adapter *adapter,
 	if (err)
 		kfree(filter);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 	return err;
 }
 
@@ -3226,8 +3219,7 @@ static int iavf_open(struct net_device *netdev)
 		return -EIO;
 	}
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section))
+	while (!mutex_trylock(&adapter->crit_lock))
 		usleep_range(500, 1000);
 
 	if (adapter->state != __IAVF_DOWN) {
@@ -3262,7 +3254,7 @@ static int iavf_open(struct net_device *netdev)
 
 	iavf_irq_enable(adapter, true);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	return 0;
 
@@ -3274,7 +3266,7 @@ static int iavf_open(struct net_device *netdev)
 err_setup_tx:
 	iavf_free_all_tx_resources(adapter);
 err_unlock:
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	return err;
 }
@@ -3298,8 +3290,7 @@ static int iavf_close(struct net_device *netdev)
 	if (adapter->state <= __IAVF_DOWN_PENDING)
 		return 0;
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section))
+	while (!mutex_trylock(&adapter->crit_lock))
 		usleep_range(500, 1000);
 
 	set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
@@ -3310,7 +3301,7 @@ static int iavf_close(struct net_device *netdev)
 	adapter->state = __IAVF_DOWN_PENDING;
 	iavf_free_traffic_irqs(adapter);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	/* We explicitly don't free resources here because the hardware is
 	 * still active and can DMA into memory. Resources are cleared in
@@ -3659,8 +3650,8 @@ static void iavf_init_task(struct work_struct *work)
 						    init_task.work);
 	struct iavf_hw *hw = &adapter->hw;
 
-	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000)) {
-		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
+	if (iavf_lock_timeout(&adapter->crit_lock, 5000)) {
+		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
 		return;
 	}
 	switch (adapter->state) {
@@ -3695,7 +3686,7 @@ static void iavf_init_task(struct work_struct *work)
 	}
 	queue_delayed_work(iavf_wq, &adapter->init_task, HZ);
 out:
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 }
 
 /**
@@ -3712,12 +3703,12 @@ static void iavf_shutdown(struct pci_dev *pdev)
 	if (netif_running(netdev))
 		iavf_close(netdev);
 
-	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000))
-		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
+	if (iavf_lock_timeout(&adapter->crit_lock, 5000))
+		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
 	/* Prevent the watchdog from running. */
 	adapter->state = __IAVF_REMOVE;
 	adapter->aq_required = 0;
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 #ifdef CONFIG_PM
 	pci_save_state(pdev);
@@ -3811,6 +3802,9 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* set up the locks for the AQ, do this only once in probe
 	 * and destroy them only once in remove
 	 */
+	mutex_init(&adapter->crit_lock);
+	mutex_init(&adapter->client_lock);
+	mutex_init(&adapter->remove_lock);
 	mutex_init(&hw->aq.asq_mutex);
 	mutex_init(&hw->aq.arq_mutex);
 
@@ -3862,8 +3856,7 @@ static int __maybe_unused iavf_suspend(struct device *dev_d)
 
 	netif_device_detach(netdev);
 
-	while (test_and_set_bit(__IAVF_IN_CRITICAL_TASK,
-				&adapter->crit_section))
+	while (!mutex_trylock(&adapter->crit_lock))
 		usleep_range(500, 1000);
 
 	if (netif_running(netdev)) {
@@ -3874,7 +3867,7 @@ static int __maybe_unused iavf_suspend(struct device *dev_d)
 	iavf_free_misc_irq(adapter);
 	iavf_reset_interrupt_capability(adapter);
 
-	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	mutex_unlock(&adapter->crit_lock);
 
 	return 0;
 }
@@ -3936,7 +3929,7 @@ static void iavf_remove(struct pci_dev *pdev)
 	struct iavf_hw *hw = &adapter->hw;
 	int err;
 	/* Indicate we are in remove and not to run reset_task */
-	set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
+	mutex_lock(&adapter->remove_lock);
 	cancel_delayed_work_sync(&adapter->init_task);
 	cancel_work_sync(&adapter->reset_task);
 	cancel_delayed_work_sync(&adapter->client_task);
@@ -3958,8 +3951,8 @@ static void iavf_remove(struct pci_dev *pdev)
 		iavf_request_reset(adapter);
 		msleep(50);
 	}
-	if (iavf_lock_timeout(adapter, __IAVF_IN_CRITICAL_TASK, 5000))
-		dev_warn(&adapter->pdev->dev, "failed to set __IAVF_IN_CRITICAL_TASK in %s\n", __FUNCTION__);
+	if (iavf_lock_timeout(&adapter->crit_lock, 5000))
+		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
 
 	/* Shut down all the garbage mashers on the detention level */
 	adapter->state = __IAVF_REMOVE;
@@ -3984,6 +3977,11 @@ static void iavf_remove(struct pci_dev *pdev)
 	/* destroy the locks only once, here */
 	mutex_destroy(&hw->aq.arq_mutex);
 	mutex_destroy(&hw->aq.asq_mutex);
+	mutex_destroy(&adapter->client_lock);
+	mutex_unlock(&adapter->crit_lock);
+	mutex_destroy(&adapter->crit_lock);
+	mutex_unlock(&adapter->remove_lock);
+	mutex_destroy(&adapter->remove_lock);
 
 	iounmap(hw->hw_addr);
 	pci_release_regions(pdev);
-- 
2.30.2