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    Subject[PATCH 3.2 05/61] PCI: shpchp: Enable bridge bus mastering if MSI is enabled
    3.2.96-rc1 review patch.  If anyone has any objections, please let me know.


    From: Aleksandr Bezzubikov <>

    commit 48b79a14505349a29b3e20f03619ada9b33c4b17 upstream.

    An SHPC may generate MSIs to notify software about slot or controller
    events (SHPC spec r1.0, sec 4.7). A PCI device can only generate an MSI if
    it has bus mastering enabled.

    Enable bus mastering if the bridge contains an SHPC that uses MSI for event

    Signed-off-by: Aleksandr Bezzubikov <>
    [bhelgaas: changelog]
    Signed-off-by: Bjorn Helgaas <>
    Reviewed-by: Marcel Apfelbaum <>
    Acked-by: Michael S. Tsirkin <>
    [bwh: Backported to 3.2: adjust context]
    Signed-off-by: Ben Hutchings <>
    drivers/pci/hotplug/shpchp_hpc.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/pci/hotplug/shpchp_hpc.c
    +++ b/drivers/pci/hotplug/shpchp_hpc.c
    @@ -1064,6 +1064,8 @@ int shpc_init(struct controller *ctrl, s
    "Can't get msi for the hotplug controller\n");
    "Use INTx for the hotplug controller\n");
    + } else {
    + pci_set_master(pdev);

    rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,
     \ /
      Last update: 2017-11-22 03:21    [W:4.513 / U:0.820 seconds]
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