linux-kernel - [PATCH 3.2 05/61] PCI: shpchp: Enable bridge bus mastering if MSI is enabled

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Date:   Wed, 22 Nov 2017 02:11:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Michael S. Tsirkin" <mst@...hat.com>,
        "Marcel Apfelbaum" <marcel@...hat.com>,
        "Aleksandr Bezzubikov" <zuban32s@...il.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>
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 <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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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");
 			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,