linux-kernel - Re: [PATCH net 1/2] net: tehuti: Fix a missing pci_disable_msi() in the error handling path of bdx

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Date: Wed, 28 Feb 2024 18:52:30 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Jiri Pirko <jiri@...nulli.us>
Cc: andy@...yhouse.net, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net 1/2] net: tehuti: Fix a missing pci_disable_msi() in
 the error handling path of bdx_probe()

Le 28/02/2024 à 10:51, Jiri Pirko a écrit :
> Tue, Feb 27, 2024 at 09:50:55PM CET, christophe.jaillet@...adoo.fr wrote:
>> If an error occurs after a successful call to pci_enable_msi(),
>> pci_disable_msi() should be called as already done in the remove function.
>>
>> Add a new label and the missing pci_disable_msi() call.
>>
>> Fixes: 1a348ccc1047 ("[NET]: Add Tehuti network driver.")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>> Compile tested only.
>> ---
>> drivers/net/ethernet/tehuti/tehuti.c | 9 +++++++--
>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/tehuti/tehuti.c b/drivers/net/ethernet/tehuti/tehuti.c
>> index ca409515ead5..938a5caf5a3b 100644
>> --- a/drivers/net/ethernet/tehuti/tehuti.c
>> +++ b/drivers/net/ethernet/tehuti/tehuti.c
>> @@ -1965,7 +1965,7 @@ bdx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>> 		ndev = alloc_etherdev(sizeof(struct bdx_priv));
>> 		if (!ndev) {
>> 			err = -ENOMEM;
>> -			goto err_out_iomap;
>> +			goto err_out_disable_msi;
>> 		}
>>
>> 		ndev->netdev_ops = &bdx_netdev_ops;
>> @@ -2031,7 +2031,7 @@ bdx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>> 		if (bdx_read_mac(priv)) {
>> 			pr_err("load MAC address failed\n");
>> 			err = -EFAULT;
>> -			goto err_out_iomap;
>> +			goto err_out_disable_msi;
>> 		}
>> 		SET_NETDEV_DEV(ndev, &pdev->dev);
>> 		err = register_netdev(ndev);
>> @@ -2048,6 +2048,11 @@ bdx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>>
>> err_out_free:
>> 	free_netdev(ndev);
>> +err_out_disable_msi:
>> +#ifdef BDX_MSI
> 
> ifdef does not seem to be necessary here. The irq_type check should be
> enough.

I thought about removing it, but I left it because it how it is done in 
the remove function.

I'll send a v2 without the ifdef and will also add another patch to 
remove it as well from the remove function.

CJ

> 
> pw-bot: cr
> 
> 
>> +	if (nic->irq_type == IRQ_MSI)
>> +		pci_disable_msi(pdev);
>> +#endif
>> err_out_iomap:
>> 	iounmap(nic->regs);
>> err_out_res:
>> -- 
>> 2.43.2
>>
>>
> 
>