netdev - [PATCH net-next 02/12] nfp: release global resources only on the remove path

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Message-Id: <20180118025106.30427-3-jakub.kicinski@netronome.com>
Date:   Wed, 17 Jan 2018 18:50:56 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 02/12] nfp: release global resources only on the remove path

NFP app is currently shut down as soon as all the vNICs are gone.
This means we can't depend on the app existing throughout the
lifetime of the device.  Free the app only from PCI remove path.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_main.c | 36 ++++++++---------------
 1 file changed, 13 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
index c505014121c4..e4f4aa5c298e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
@@ -570,17 +570,6 @@ static int nfp_net_pci_map_mem(struct nfp_pf *pf)
 	return err;
 }
 
-static void nfp_net_pci_remove_finish(struct nfp_pf *pf)
-{
-	nfp_net_pf_app_stop(pf);
-	/* stop app first, to avoid double free of ctrl vNIC's ddir */
-	nfp_net_debugfs_dir_clean(&pf->ddir);
-
-	nfp_net_pf_free_irqs(pf);
-	nfp_net_pf_app_clean(pf);
-	nfp_net_pci_unmap_mem(pf);
-}
-
 static int
 nfp_net_eth_port_update(struct nfp_cpp *cpp, struct nfp_port *port,
 			struct nfp_eth_table *eth_table)
@@ -655,9 +644,6 @@ int nfp_net_refresh_port_table_sync(struct nfp_pf *pf)
 		nfp_net_pf_free_vnic(pf, nn);
 	}
 
-	if (list_empty(&pf->vnics))
-		nfp_net_pci_remove_finish(pf);
-
 	return 0;
 }
 
@@ -810,20 +796,24 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 
 void nfp_net_pci_remove(struct nfp_pf *pf)
 {
-	struct nfp_net *nn;
+	struct nfp_net *nn, *next;
 
 	mutex_lock(&pf->lock);
-	if (list_empty(&pf->vnics))
-		goto out;
+	list_for_each_entry_safe(nn, next, &pf->vnics, vnic_list) {
+		if (!nfp_net_is_data_vnic(nn))
+			continue;
+		nfp_net_pf_clean_vnic(pf, nn);
+		nfp_net_pf_free_vnic(pf, nn);
+	}
 
-	list_for_each_entry(nn, &pf->vnics, vnic_list)
-		if (nfp_net_is_data_vnic(nn))
-			nfp_net_pf_clean_vnic(pf, nn);
+	nfp_net_pf_app_stop(pf);
+	/* stop app first, to avoid double free of ctrl vNIC's ddir */
+	nfp_net_debugfs_dir_clean(&pf->ddir);
 
-	nfp_net_pf_free_vnics(pf);
+	nfp_net_pf_free_irqs(pf);
+	nfp_net_pf_app_clean(pf);
+	nfp_net_pci_unmap_mem(pf);
 
-	nfp_net_pci_remove_finish(pf);
-out:
 	mutex_unlock(&pf->lock);
 
 	cancel_work_sync(&pf->port_refresh_work);
-- 
2.15.1