linux-kernel - [PATCH net] fbnic: Set napi irq value after calling netif_napi

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Message-ID: <20240912174922.10550-1-brett.creeley@amd.com>
Date: Thu, 12 Sep 2024 10:49:22 -0700
From: Brett Creeley <brett.creeley@....com>
To: <alexanderduyck@...com>, <kuba@...nel.org>, <kernel-team@...a.com>,
	<davem@...emloft.net>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <jdamato@...tly.com>, <brett.creeley@....com>, <stable@...r.kernel.org>
Subject: [PATCH net] fbnic: Set napi irq value after calling netif_napi_add

The driver calls netif_napi_set_irq() and then calls netif_napi_add(),
which calls netif_napi_add_weight(). At the end of
netif_napi_add_weight() is a call to netif_napi_set_irq(napi, -1), which
clears the previously set napi->irq value. Fix this by calling
netif_napi_set_irq() after calling netif_napi_add().

This was found when reviewing another patch and I have no way to test
this, but the fix seemed relatively straight forward.

Cc: stable@...r.kernel.org
Fixes: bc6107771bb4 ("eth: fbnic: Allocate a netdevice and napi vectors with queues")
Signed-off-by: Brett Creeley <brett.creeley@....com>
---
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
index 0ed4c9fff5d8..72f88ae7815f 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
@@ -1012,14 +1012,14 @@ static int fbnic_alloc_napi_vector(struct fbnic_dev *fbd, struct fbnic_net *fbn,
 	nv->fbd = fbd;
 	nv->v_idx = v_idx;
 
-	/* Record IRQ to NAPI struct */
-	netif_napi_set_irq(&nv->napi,
-			   pci_irq_vector(to_pci_dev(fbd->dev), nv->v_idx));
-
 	/* Tie napi to netdev */
 	list_add(&nv->napis, &fbn->napis);
 	netif_napi_add(fbn->netdev, &nv->napi, fbnic_poll);
 
+	/* Record IRQ to NAPI struct */
+	netif_napi_set_irq(&nv->napi,
+			   pci_irq_vector(to_pci_dev(fbd->dev), nv->v_idx));
+
 	/* Tie nv back to PCIe dev */
 	nv->dev = fbd->dev;
 
-- 
2.17.1