[PATCH 5/5] PCI: add device wait after slot and bus reset

Sinan Kaya
2017-09-24T00:17:17Z

Rev 3.1 Sec 2.3.1 Request Handling Rules indicates that a device can issue
CRS following secondary bus reset. Handle device presence gracefully.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/pci/pci.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 074adf9..7131aab 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4056,7 +4056,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)

pci_reset_bridge_secondary_bus(dev->bus->self);

- return 0;
+ return pci_dev_wait(dev, "bus reset", 1000, 60000);
}

static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
@@ -4077,6 +4077,7 @@ static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
{
struct pci_dev *pdev;
+ int rc;

if (dev->subordinate || !dev->slot ||
dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
@@ -4086,7 +4087,11 @@ static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
if (pdev != dev && pdev->slot == dev->slot)
return -ENOTTY;

- return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
+ rc = pci_reset_hotplug_slot(dev->slot->hotplug, probe);
+ if (!rc && !probe)
+ rc = pci_dev_wait(dev, "slot reset", 1000, 60000);
+
+ return rc;
}

static void pci_dev_lock(struct pci_dev *dev)
--
1.9.1