linux-kernel - [PATCH 17/69] net/smc: properly handle workqueue allocation failure

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Message-Id: <20210503115736.2104747-18-gregkh@linuxfoundation.org>
Date:   Mon,  3 May 2021 13:56:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Anirudh Rayabharam <mail@...rudhrb.com>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 17/69] net/smc: properly handle workqueue allocation failure

From: Anirudh Rayabharam <mail@...rudhrb.com>

In smcd_alloc_dev(), if alloc_ordered_workqueue() fails, properly catch
it, clean up and return NULL to let the caller know there was a failure.
Move the call to alloc_ordered_workqueue higher in the function in order
to abort earlier without needing to unwind the call to device_initialize().

Cc: Ursula Braun <ubraun@...ux.ibm.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/smc/smc_ism.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 6558cf7643a7..94b31f2551bc 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -402,6 +402,14 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
 		return NULL;
 	}
 
+	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
+						 WQ_MEM_RECLAIM, name);
+	if (!smcd->event_wq) {
+		kfree(smcd->conn);
+		kfree(smcd);
+		return NULL;
+	}
+
 	smcd->dev.parent = parent;
 	smcd->dev.release = smcd_release;
 	device_initialize(&smcd->dev);
@@ -415,8 +423,6 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
 	INIT_LIST_HEAD(&smcd->vlan);
 	INIT_LIST_HEAD(&smcd->lgr_list);
 	init_waitqueue_head(&smcd->lgrs_deleted);
-	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
-						 WQ_MEM_RECLAIM, name);
 	return smcd;
 }
 EXPORT_SYMBOL_GPL(smcd_alloc_dev);
-- 
2.31.1