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

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Message-ID: <20230408093316.GE11124@thinkpad>
Date:   Sat, 8 Apr 2023 15:03:16 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     jdmason@...zu.us, dave.jiang@...el.com, allenbh@...il.com,
        lpieralisi@...nel.org, kw@...ux.com, kishon@...nel.org,
        bhelgaas@...gle.com, ntb@...ts.linux.dev,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: endpoint: pci-epf-ntb: Add missing check for
 alloc_workqueue

On Wed, Jan 04, 2023 at 05:16:01PM +0800, Jiasheng Jiang wrote:
> Add check for the return value of alloc_workqueue since it may return
> NULL pointer.
> 
> Fixes: 8b821cf76150 ("PCI: endpoint: Add EP function driver to provide NTB functionality")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

- Mani

> ---
>  drivers/pci/endpoint/functions/pci-epf-ntb.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c b/drivers/pci/endpoint/functions/pci-epf-ntb.c
> index 9a00448c7e61..304956bc0516 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-ntb.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c
> @@ -2124,6 +2124,9 @@ 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
> 

-- 
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