Disable MSI also when pcie-octeon.pcie_disable on

BugLink: https://bugs.launchpad.net/bugs/1837477
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@wavecomp.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: pburton@wavecomp.com
Cc: linux-mips@vger.kernel.org
Cc: aaro.koskinen@iki.fi
Cc: stable@vger.kernel.org # v3.3+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c
index 2a5bb849b10efa742a82f8855708b4afcc8a9c4e..288b58b00dc84537fd1d49f43da0ecd3db02aefd 100644 (file)
--- 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;