netdev - [net-next v2 04/15] ice: avoid setting features during reset

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Message-Id: <20191108203806.12109-5-jeffrey.t.kirsher@intel.com>
Date:   Fri,  8 Nov 2019 12:37:55 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Henry Tieman <henry.w.tieman@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com,
        Andrew Bowers <andrewx.bowers@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next v2 04/15] ice: avoid setting features during reset

From: Henry Tieman <henry.w.tieman@...el.com>

Certain subsystems behave very badly when called during reset (core
dump). This patch returns -EBUSY when reconfiguring some subsystems
during reset. With this patch some ethtool functions will not core
dump during reset.

Signed-off-by: Henry Tieman <henry.w.tieman@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index d963aec59845..cb93fe5529f6 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3776,6 +3776,7 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 {
 	struct ice_netdev_priv *np = netdev_priv(netdev);
 	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
 	int ret = 0;
 
 	/* Don't set any netdev advanced features with device in Safe Mode */
@@ -3785,6 +3786,13 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 		return ret;
 	}
 
+	/* Do not change setting during reset */
+	if (ice_is_reset_in_progress(pf->state)) {
+		dev_err(&vsi->back->pdev->dev,
+			"Device is resetting, changing advanced netdev features temporarily unavailable.\n");
+		return -EBUSY;
+	}
+
 	/* Multiple features can be changed in one call so keep features in
 	 * separate if/else statements to guarantee each feature is checked
 	 */
-- 
2.21.0