Patchwork [v2,5/8] pci: Add reset_slot option to pci_dev_reset

login
register
mail settings
Submitter Alex Williamson
Date May 8, 2013, 2:58 a.m.
Message ID <20130508025807.30771.14527.stgit@bling.home>
Download mbox | patch
Permalink /patch/242487/
State Superseded
Headers show

Comments

Alex Williamson - May 8, 2013, 2:58 a.m.
If the hotplug controller provides a way to reset a slot, use that
before a direct parent bus reset.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/pci/pci.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)


--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d0f313f..f5035f5 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -22,6 +22,7 @@ 
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
+#include <linux/pci_hotplug.h>
 #include <asm-generic/pci-bridge.h>
 #include <asm/setup.h>
 #include "pci.h"
@@ -3251,6 +3252,20 @@  static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
 	return 0;
 }
 
+static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
+{
+	struct pci_dev *pdev;
+
+	if (dev->subordinate || !dev->slot)
+		return -ENOTTY;
+
+	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
+		if (pdev != dev && pdev->slot == dev->slot)
+			return -ENOTTY;
+
+	return pci_hp_reset_slot(dev->slot->hotplug, probe);
+}
+
 static int __pci_dev_reset(struct pci_dev *dev, int probe)
 {
 	int rc;
@@ -3273,6 +3288,10 @@  static int __pci_dev_reset(struct pci_dev *dev, int probe)
 	if (rc != -ENOTTY)
 		goto done;
 
+	rc = pci_dev_reset_slot_function(dev, probe);
+	if (rc != -ENOTTY)
+		goto done;
+
 	rc = pci_parent_bus_reset(dev, probe);
 done:
 	return rc;