netdev - [PATCH net 3/8] iavf: use internal state to free traffic IRQs

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Message-Id: <20230717175205.3217774-4-anthony.l.nguyen@intel.com>
Date: Mon, 17 Jul 2023 10:52:00 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	netdev@...r.kernel.org
Cc: Ahmed Zaki <ahmed.zaki@...el.com>,
	anthony.l.nguyen@...el.com,
	ivecera@...hat.com,
	sassmann@...nic.de,
	Rafal Romanowski <rafal.romanowski@...el.com>
Subject: [PATCH net 3/8] iavf: use internal state to free traffic IRQs

From: Ahmed Zaki <ahmed.zaki@...el.com>

If the system tries to close the netdev while iavf_reset_task() is
running, __LINK_STATE_START will be cleared and netif_running() will
return false in iavf_reinit_interrupt_scheme(). This will result in
iavf_free_traffic_irqs() not being called and a leak as follows:

    [7632.489326] remove_proc_entry: removing non-empty directory 'irq/999', leaking at least 'iavf-enp24s0f0v0-TxRx-0'
    [7632.490214] WARNING: CPU: 0 PID: 10 at fs/proc/generic.c:718 remove_proc_entry+0x19b/0x1b0

is shown when pci_disable_msix() is later called. Fix by using the
internal adapter state. The traffic IRQs will always exist if
state == __IAVF_RUNNING.

Fixes: 5b36e8d04b44 ("i40evf: Enable VF to request an alternate queue allocation")
Signed-off-by: Ahmed Zaki <ahmed.zaki@...el.com>
Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 89d88c3a7add..058e19c6f94a 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -1929,15 +1929,16 @@ static void iavf_free_rss(struct iavf_adapter *adapter)
 /**
  * iavf_reinit_interrupt_scheme - Reallocate queues and vectors
  * @adapter: board private structure
+ * @running: true if adapter->state == __IAVF_RUNNING
  *
  * Returns 0 on success, negative on failure
  **/
-static int iavf_reinit_interrupt_scheme(struct iavf_adapter *adapter)
+static int iavf_reinit_interrupt_scheme(struct iavf_adapter *adapter, bool running)
 {
 	struct net_device *netdev = adapter->netdev;
 	int err;
 
-	if (netif_running(netdev))
+	if (running)
 		iavf_free_traffic_irqs(adapter);
 	iavf_free_misc_irq(adapter);
 	iavf_reset_interrupt_capability(adapter);
@@ -3053,7 +3054,7 @@ static void iavf_reset_task(struct work_struct *work)
 
 	if ((adapter->flags & IAVF_FLAG_REINIT_MSIX_NEEDED) ||
 	    (adapter->flags & IAVF_FLAG_REINIT_ITR_NEEDED)) {
-		err = iavf_reinit_interrupt_scheme(adapter);
+		err = iavf_reinit_interrupt_scheme(adapter, running);
 		if (err)
 			goto reset_err;
 	}
-- 
2.38.1