linux-kernel - [PATCH net 1/1] stmmac: intel: Fix kernel panic on pci probe

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Message-Id: <20201029093228.1741-1-vee.khee.wong@intel.com>
Date:   Thu, 29 Oct 2020 17:32:28 +0800
From:   Wong Vee Khee <vee.khee.wong@...el.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Voon Wei Feng <weifeng.voon@...el.com>,
        Wong Vee Khee <vee.khee.wong@...el.com>
Subject: [PATCH net 1/1] stmmac: intel: Fix kernel panic on pci probe

The commit "stmmac: intel: Adding ref clock 1us tic for LPI cntr"
introduced a regression which leads to the kernel panic duing loading
of the dwmac_intel module.

Move the code block after pci resources is obtained.

Fixes: b4c5f83ae3f3 ("stmmac: intel: Adding ref clock 1us tic for LPI cntr")
Cc: Voon Weifeng <weifeng.voon@...el.com>
Signed-off-by: Wong Vee Khee <vee.khee.wong@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index b6e5e3e36b63..81ee0a071b4e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -625,13 +625,6 @@ static int intel_eth_pci_probe(struct pci_dev *pdev,
 	if (ret)
 		return ret;
 
-	if (plat->eee_usecs_rate > 0) {
-		u32 tx_lpi_usec;
-
-		tx_lpi_usec = (plat->eee_usecs_rate / 1000000) - 1;
-		writel(tx_lpi_usec, res.addr + GMAC_1US_TIC_COUNTER);
-	}
-
 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 	if (ret < 0)
 		return ret;
@@ -641,6 +634,13 @@ static int intel_eth_pci_probe(struct pci_dev *pdev,
 	res.wol_irq = pci_irq_vector(pdev, 0);
 	res.irq = pci_irq_vector(pdev, 0);
 
+	if (plat->eee_usecs_rate > 0) {
+		u32 tx_lpi_usec;
+
+		tx_lpi_usec = (plat->eee_usecs_rate / 1000000) - 1;
+		writel(tx_lpi_usec, res.addr + GMAC_1US_TIC_COUNTER);
+	}
+
 	ret = stmmac_dvr_probe(&pdev->dev, plat, &res);
 	if (ret) {
 		pci_free_irq_vectors(pdev);
-- 
2.17.0