netdev - [PATCH net-next 3/7] ionic: move lif mutex setup and delete

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Message-Id: <20211001173758.22072-4-snelson@pensando.io>
Date:   Fri,  1 Oct 2021 10:37:54 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Cc:     drivers@...sando.io, jtoppins@...hat.com,
        Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 3/7] ionic: move lif mutex setup and delete

Move creation and deletion of lif mutex a level out to
lif creation and delete, rather than in init and deinit.
This assures that nothing will get hung if anything is waiting
on the mutex while the driver is clearing the lif while handling
the fw_down/fw_up cycle.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 381966e8f557..4f28cd3ea454 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2890,6 +2890,9 @@ int ionic_lif_alloc(struct ionic *ionic)
 
 	snprintf(lif->name, sizeof(lif->name), "lif%u", lif->index);
 
+	mutex_init(&lif->queue_lock);
+	mutex_init(&lif->config_lock);
+
 	spin_lock_init(&lif->adminq_lock);
 
 	spin_lock_init(&lif->deferred.lock);
@@ -2903,7 +2906,7 @@ int ionic_lif_alloc(struct ionic *ionic)
 	if (!lif->info) {
 		dev_err(dev, "Failed to allocate lif info, aborting\n");
 		err = -ENOMEM;
-		goto err_out_free_netdev;
+		goto err_out_free_mutex;
 	}
 
 	ionic_debugfs_add_lif(lif);
@@ -2938,6 +2941,9 @@ int ionic_lif_alloc(struct ionic *ionic)
 	dma_free_coherent(dev, lif->info_sz, lif->info, lif->info_pa);
 	lif->info = NULL;
 	lif->info_pa = 0;
+err_out_free_mutex:
+	mutex_destroy(&lif->config_lock);
+	mutex_destroy(&lif->queue_lock);
 err_out_free_netdev:
 	free_netdev(lif->netdev);
 	lif = NULL;
@@ -3078,6 +3084,9 @@ void ionic_lif_free(struct ionic_lif *lif)
 	kfree(lif->dbid_inuse);
 	lif->dbid_inuse = NULL;
 
+	mutex_destroy(&lif->config_lock);
+	mutex_destroy(&lif->queue_lock);
+
 	/* free netdev & lif */
 	ionic_debugfs_del_lif(lif);
 	free_netdev(lif->netdev);
@@ -3100,8 +3109,6 @@ void ionic_lif_deinit(struct ionic_lif *lif)
 	ionic_lif_qcq_deinit(lif, lif->notifyqcq);
 	ionic_lif_qcq_deinit(lif, lif->adminqcq);
 
-	mutex_destroy(&lif->config_lock);
-	mutex_destroy(&lif->queue_lock);
 	ionic_lif_reset(lif);
 }
 
@@ -3267,8 +3274,6 @@ int ionic_lif_init(struct ionic_lif *lif)
 		return err;
 
 	lif->hw_index = le16_to_cpu(comp.hw_index);
-	mutex_init(&lif->queue_lock);
-	mutex_init(&lif->config_lock);
 
 	/* now that we have the hw_index we can figure out our doorbell page */
 	lif->dbid_count = le32_to_cpu(lif->ionic->ident.dev.ndbpgs_per_lif);
-- 
2.17.1