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 10:51:12 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
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()

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.

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
>
>