netdev - [PATCH net 5/8] iavf: Fix race in init state

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Date:   Fri, 25 Feb 2022 11:46:11 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Slawomir Laba <slawomirx.laba@...el.com>, netdev@...r.kernel.org,
        anthony.l.nguyen@...el.com, sassmann@...hat.com,
        Phani Burra <phani.r.burra@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Mateusz Palczewski <mateusz.palczewski@...el.com>,
        Konrad Jankowski <konrad0.jankowski@...el.com>
Subject: [PATCH net 5/8] iavf: Fix race in init state

From: Slawomir Laba <slawomirx.laba@...el.com>

When iavf_init_version_check sends VIRTCHNL_OP_GET_VF_RESOURCES
message, the driver will wait for the response after requeueing
the watchdog task in iavf_init_get_resources call stack. The
logic is implemented this way that iavf_init_get_resources has
to be called in order to allocate adapter->vf_res. It is polling
for the AQ response in iavf_get_vf_config function. Expect a
call trace from kernel when adminq_task worker handles this
message first. adapter->vf_res will be NULL in
iavf_virtchnl_completion.

Make the watchdog task not queue the adminq_task if the init
process is not finished yet.

Fixes: 898ef1cb1cb2 ("iavf: Combine init and watchdog state machines")
Signed-off-by: Slawomir Laba <slawomirx.laba@...el.com>
Signed-off-by: Phani Burra <phani.r.burra@...el.com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 67349d24dc90..36433d6504b7 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -2532,7 +2532,8 @@ static void iavf_watchdog_task(struct work_struct *work)
 	schedule_delayed_work(&adapter->client_task, msecs_to_jiffies(5));
 	mutex_unlock(&adapter->crit_lock);
 restart_watchdog:
-	queue_work(iavf_wq, &adapter->adminq_task);
+	if (adapter->state >= __IAVF_DOWN)
+		queue_work(iavf_wq, &adapter->adminq_task);
 	if (adapter->aq_required)
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
 				   msecs_to_jiffies(20));
-- 
2.31.1