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PCI: shpchp: Enable bridge bus mastering if MSI is enabled

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commit 48b79a1450 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
notifications.

Signed-off-by: Aleksandr Bezzubikov <zuban32s@gmail.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksandr Bezzubikov
2017-07-18 17:12:25 +03:00
committed by Greg Kroah-Hartman
parent 81306fc3db
commit 7498bd6058
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/hotplug/shpchp_hpc.c
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@@ -1062,6 +1062,8 @@ int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
if (rc) {
ctrl_info(ctrl, "Can't get msi for the hotplug controller\n");
ctrl_info(ctrl, "Use INTx for the hotplug controller\n");
} else {
pci_set_master(pdev);
}
rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,