gve: Update mgmt_msix_idx if num_ntfy changes

stable inclusion
from stable-5.10.42
commit 7114438671d6ad4be746ad13d74f278db273db0c
bugzilla: 55093
CVE: NA

--------------------------------

[ Upstream commit e96b491a ]

If we do not get the expected number of vectors from
pci_enable_msix_range, we update priv->num_ntfy_blks but not
priv->mgmt_msix_idx. This patch fixes this so that priv->mgmt_msix_idx
is updated accordingly.

Fixes: f5cedc84 ("gve: Add transmit and receive support")
Signed-off-by: NDavid Awogbemila <awogbemila@google.com>
Acked-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/google/gve/gve_main.c

@@ -220,6 +220,7 @@ static int gve_alloc_notify_blocks(struct gve_priv *priv)
 		int vecs_left = new_num_ntfy_blks % 2;
 
 		priv->num_ntfy_blks = new_num_ntfy_blks;
+		priv->mgmt_msix_idx = priv->num_ntfy_blks;
 		priv->tx_cfg.max_queues = min_t(int, priv->tx_cfg.max_queues,
 						vecs_per_type);
 		priv->rx_cfg.max_queues = min_t(int, priv->rx_cfg.max_queues,