Patch "PCI: shpchp: Enable bridge bus mastering if MSI is enabled" has been added to the 4.13-stable tree

Patch "PCI: shpchp: Enable bridge bus mastering if MSI is enabled" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-shpchp-enable-bridge-bus-mastering-if-msi-is-enabled.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 48b79a14505349a29b3e20f03619ada9b33c4b17 Mon Sep 17 00:00:00 2001
From: Aleksandr Bezzubikov <zuban32s@gmail.com>
Date: Tue, 18 Jul 2017 17:12:25 +0300
Subject: PCI: shpchp: Enable bridge bus mastering if MSI is enabled

From: Aleksandr Bezzubikov <zuban32s@gmail.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@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>

---
 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,


Patches currently in stable-queue which might be from zuban32s@gmail.com are

queue-4.13/pci-shpchp-enable-bridge-bus-mastering-if-msi-is-enabled.patch