If the device is PCI based like intel-eth-pci, pm_runtime_enable() is
already called by pci_pm_init().

So only pm_runtime_enable() when it's not already enabled.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 63ff2dad8c85f..6708ca2aa4f73 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7159,7 +7159,8 @@ int stmmac_dvr_probe(struct device *device,
 
 	pm_runtime_get_noresume(device);
 	pm_runtime_set_active(device);
-	pm_runtime_enable(device);
+	if (!pm_runtime_enabled(device))
+		pm_runtime_enable(device);
 
 	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI) {
-- 
2.33.1

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 14 Jan 2022 15:14:30 +0800 you wrote:
> If the device is PCI based like intel-eth-pci, pm_runtime_enable() is
> already called by pci_pm_init().
> 
> So only pm_runtime_enable() when it's not already enabled.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> 
> [...]

Here is the summary with links:
  - net: stmmac: Fix "Unbalanced pm_runtime_enable!" warning
    https://git.kernel.org/netdev/net/c/d90d0c175cf2

You are awesome, thank you!
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