linux-kernel - [PATCH 1/3] PCI: vmd: Correct PCI Header Type Register's MFD bit check

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Message-Id: <20231003125300.5541-2-ilpo.jarvinen@linux.intel.com>
Date:   Tue,  3 Oct 2023 15:52:58 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        bcm-kernel-feedback-list@...adcom.com, jonathan.derrick@...ux.dev,
        kw@...ux.com, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-renesas-soc@...r.kernel.org,
        lpieralisi@...nel.org, marek.vasut+renesas@...il.com,
        minghuan.Lian@....com, mingkai.hu@....com,
        m.karthikeyan@...iveil.co.in, nirmal.patel@...ux.intel.com,
        rjui@...adcom.com, robh@...nel.org, roy.zang@....com,
        sbranden@...adcom.com, yoshihiro.shimoda.uh@...esas.com,
        Zhiqiang.Hou@....com, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/3] PCI: vmd: Correct PCI Header Type Register's MFD bit check

vmd_domain_reset() attempts to find whether the device may contain
multiple functions by checking 0x80 (Multi-Function Device), however,
the hdr_type variable has already been masked with PCI_HEADER_TYPE_MASK
so the check can never true.

To fix the issue, don't mask the read with PCI_HEADER_TYPE_MASK.

Fixes: 6aab5622296b ("PCI: vmd: Clean up domain before enumeration")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Nirmal Patel <nirmal.patel@...ux.intel.com>
---
 drivers/pci/controller/vmd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index e718a816d481..d5b97a6aae56 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -525,8 +525,7 @@ static void vmd_domain_reset(struct vmd_dev *vmd)
 			base = vmd->cfgbar + PCIE_ECAM_OFFSET(bus,
 						PCI_DEVFN(dev, 0), 0);
 
-			hdr_type = readb(base + PCI_HEADER_TYPE) &
-					 PCI_HEADER_TYPE_MASK;
+			hdr_type = readb(base + PCI_HEADER_TYPE);
 
 			functions = (hdr_type & 0x80) ? 8 : 1;
 			for (fn = 0; fn < functions; fn++) {
-- 
2.30.2