linux-kernel - [PATCH V2 3/5] PCI: save and restore bus on parent bus reset

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Date:   Fri, 16 Sep 2016 16:06:32 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        cov@...eaurora.org, alex.williamson@...hat.com,
        vikrams@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V2 3/5] PCI: save and restore bus on parent bus reset

Device states on the bus are saved and restored for all bus resets except
the one initiated through pci_dev_reset. Filling the hole.

Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
 drivers/pci/pci.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aab9d51..8aecab1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -51,6 +51,10 @@ static void pci_pme_list_scan(struct work_struct *work);
 static LIST_HEAD(pci_pme_list);
 static DEFINE_MUTEX(pci_pme_list_mutex);
 static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan);
+static void pci_dev_lock(struct pci_dev *dev);
+static void pci_dev_unlock(struct pci_dev *dev);
+static void pci_bus_save_and_disable(struct pci_bus *bus);
+static void pci_bus_restore(struct pci_bus *bus);
 
 struct pci_pme_device {
 	struct list_head list;
@@ -3888,8 +3892,18 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
 	if (probe)
 		return 0;
 
+	if (!probe) {
+		pci_dev_unlock(dev);
+		pci_bus_save_and_disable(dev->bus);
+	}
+
 	pci_reset_bridge_secondary_bus(dev->bus->self);
 
+	if (!probe) {
+		pci_bus_restore(dev->bus);
+		pci_dev_lock(dev);
+	}
+
 	return 0;
 }
 
-- 
1.9.1