linux-kernel - [PATCH] PCI: endpoint: pci-epf-vntb: Add missing check for alloc

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Message-Id: <20230104090808.46085-1-jiasheng@iscas.ac.cn>
Date:   Wed,  4 Jan 2023 17:08:08 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     jdmason@...zu.us, dave.jiang@...el.com, allenbh@...il.com,
        lpieralisi@...nel.org, kw@...ux.com, mani@...nel.org,
        kishon@...nel.org, bhelgaas@...gle.com
Cc:     ntb@...ts.linux.dev, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] PCI: endpoint: pci-epf-vntb: Add missing check for alloc_workqueue

Add check for the return value of alloc_workqueue since it may return
NULL pointer.

Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 04698e7995a5..05c99185ba65 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -1441,6 +1441,9 @@ static int __init epf_ntb_init(void)
 
 	kpcintb_workqueue = alloc_workqueue("kpcintb", WQ_MEM_RECLAIM |
 					    WQ_HIGHPRI, 0);
+	if (!kpcintb_workqueue)
+		return -ENOMEM;
+
 	ret = pci_epf_register_driver(&epf_ntb_driver);
 	if (ret) {
 		destroy_workqueue(kpcintb_workqueue);
-- 
2.25.1