linux-kernel - [PATCH 3.18 33/42] PCI: shpchp: Enable bridge bus mastering if MSI is enabled

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Message-Id: <20170924202651.352636724@linuxfoundation.org>
Date:   Sun, 24 Sep 2017 22:28:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aleksandr Bezzubikov <zuban32s@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marcel Apfelbaum <marcel@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 3.18 33/42] PCI: shpchp: Enable bridge bus mastering if MSI is enabled

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

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

From: Aleksandr Bezzubikov <zuban32s@...il.com>

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
notifications.

Signed-off-by: Aleksandr Bezzubikov <zuban32s@...il.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Marcel Apfelbaum <marcel@...hat.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -1062,6 +1062,8 @@ int shpc_init(struct controller *ctrl, s
 		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,