sfc: Hold the RTNL lock for more of the suspend/resume cycle

I don't think these PM functions can race with userland net device
operations, but it's much easier to reason about locking if state is
consistently guarded by the same lock.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 9f88ad86f4e3..e5f3a17349af 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -2727,6 +2727,8 @@ static int efx_pm_freeze(struct device *dev)
 {
         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 
+        rtnl_lock();
+
         efx->state = STATE_UNINIT;
 
         netif_device_detach(efx->net_dev);
@@ -2734,6 +2736,8 @@ static int efx_pm_freeze(struct device *dev)
         efx_stop_all(efx);
         efx_stop_interrupts(efx, false);
 
+        rtnl_unlock();
+
         return 0;
 }
 
@@ -2741,6 +2745,8 @@ static int efx_pm_thaw(struct device *dev)
 {
         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 
+        rtnl_lock();
+
         efx_start_interrupts(efx, false);
 
         mutex_lock(&efx->mac_lock);
@@ -2755,6 +2761,8 @@ static int efx_pm_thaw(struct device *dev)
 
         efx->type->resume_wol(efx);
 
+        rtnl_unlock();
+
         /* Reschedule any quenched resets scheduled during efx_pm_freeze() */
         queue_work(reset_workqueue, &efx->reset_work);