linux-kernel - [PATCH 4.4 053/104] Disable MSI also when pcie-octeon.pcie

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Message-Id: <20190124190201.606687228@linuxfoundation.org>
Date:   Thu, 24 Jan 2019 20:19:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, YunQiang Su <ysu@...ecomp.com>,
        Paul Burton <paul.burton@...s.com>, pburton@...ecomp.com,
        linux-mips@...r.kernel.org, aaro.koskinen@....fi
Subject: [PATCH 4.4 053/104] Disable MSI also when pcie-octeon.pcie_disable on

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: YunQiang Su <ysu@...ecomp.com>

commit a214720cbf50cd8c3f76bbb9c3f5c283910e9d33 upstream.

Octeon has an boot-time option to disable pcie.

Since MSI depends on PCI-E, we should also disable MSI also with
this option is on in order to avoid inadvertently accessing PCIe
registers.

Signed-off-by: YunQiang Su <ysu@...ecomp.com>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Cc: pburton@...ecomp.com
Cc: linux-mips@...r.kernel.org
Cc: aaro.koskinen@....fi
Cc: stable@...r.kernel.org # v3.3+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/pci/msi-octeon.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/mips/pci/msi-octeon.c
+++ b/arch/mips/pci/msi-octeon.c
@@ -369,7 +369,9 @@ int __init octeon_msi_initialize(void)
 	int irq;
 	struct irq_chip *msi;
 
-	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE) {
+	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_INVALID) {
+		return 0;
+	} else if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE) {
 		msi_rcv_reg[0] = CVMX_PEXP_NPEI_MSI_RCV0;
 		msi_rcv_reg[1] = CVMX_PEXP_NPEI_MSI_RCV1;
 		msi_rcv_reg[2] = CVMX_PEXP_NPEI_MSI_RCV2;