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net: libwx: fix VF illegal register access

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Register WX_CFG_PORT_ST is a PF restricted register. When a VF is
initialized, attempting to read this register triggers an illegal
register access, which lead to a system hang.

When the device is VF, the bus function ID can be obtained directly from
the PCI_FUNC(pdev->devfn).

Fixes: a04ea57aae ("net: libwx: fix device bus LAN ID")
Cc: stable@vger.kernel.org
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Link: https://patch.msgid.link/4D1F4452D21DE107+20260429083743.88961-1-jiawenwu@trustnetic.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiawen Wu 2026-04-29 16:37:42 +08:00 committed by Jakub Kicinski
parent 26ebd12e67
commit 694de316f6
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/wangxun/libwx/wx_hw.c
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@ -2480,8 +2480,11 @@ int wx_sw_init(struct wx *wx)
wx->oem_svid = pdev->subsystem_vendor;
wx->oem_ssid = pdev->subsystem_device;
wx->bus.device = PCI_SLOT(pdev->devfn);
wx->bus.func = FIELD_GET(WX_CFG_PORT_ST_LANID,
rd32(wx, WX_CFG_PORT_ST));
if (pdev->is_virtfn)
wx->bus.func = PCI_FUNC(pdev->devfn);
else
wx->bus.func = FIELD_GET(WX_CFG_PORT_ST_LANID,
rd32(wx, WX_CFG_PORT_ST));
if (wx->oem_svid == PCI_VENDOR_ID_WANGXUN ||
pdev->is_virtfn) {