netdev - [PATCH net] rtase: Fix a check for error in rtase_alloc

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Message-ID: <f2ecc88d-af13-4651-9820-7cc665230019@stanley.mountain>
Date: Wed, 8 Jan 2025 12:15:53 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Justin Lai <justinlai0215@...ltek.com>
Cc: Larry Chiu <larry.chiu@...ltek.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH net] rtase: Fix a check for error in rtase_alloc_msix()

The pci_irq_vector() function never returns zero.  It returns negative
error codes or a positive non-zero IRQ number.  Fix the error checking to
test for negatives.

Fixes: a36e9f5cfe9e ("rtase: Add support for a pci table in this module")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
For more information about the history of IRQ returns see my blog:
https://staticthinking.wordpress.com/2023/08/07/writing-a-check-for-zero-irq-error-codes/

 drivers/net/ethernet/realtek/rtase/rtase_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 585d0b21c9e0..3bd11cb56294 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1828,7 +1828,7 @@ static int rtase_alloc_msix(struct pci_dev *pdev, struct rtase_private *tp)
 
 	for (i = 0; i < tp->int_nums; i++) {
 		irq = pci_irq_vector(pdev, i);
-		if (!irq) {
+		if (irq < 0) {
 			pci_disable_msix(pdev);
 			return irq;
 		}
-- 
2.45.2