linux-kernel - [PATCH] PCI: Method for removing PCI devices

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Date:	Mon,  1 Dec 2008 06:08:09 -0800
From:	Trent Piepho <xyzzy@...akeasy.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pci <linux-pci@...r.kernel.org>,
	Matthew Wilcox <matthew@....cx>, Alex Chiang <achiang@...com>,
	Trent Piepho <xyzzy@...akeasy.org>
Subject: [PATCH] PCI: Method for removing PCI devices

This patch adds an attribute named "remove" to a PCI device's sysfs
directory.  Writing a non-zero value to this attribute will remove the PCI
device and any children of it.
---
 drivers/pci/pci-sysfs.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9a5bdc0..fe0f6a9 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -217,6 +217,31 @@ msi_bus_store(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
+static void remove_callback(void *data)
+{
+	pci_remove_bus_device((struct pci_dev *)data);
+}
+
+static ssize_t
+remove_store(struct device *dev, struct device_attribute *dummy,
+	     const char *buf, size_t count)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	unsigned long val;
+
+	if (strict_strtoul(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (val)
+		sysfs_schedule_callback(&dev->kobj, remove_callback, pdev,
+		                        THIS_MODULE);
+
+	return count;
+}
+
 struct device_attribute pci_dev_attrs[] = {
 	__ATTR_RO(resource),
 	__ATTR_RO(vendor),
@@ -235,6 +260,7 @@ struct device_attribute pci_dev_attrs[] = {
 	__ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 		broken_parity_status_show,broken_parity_status_store),
 	__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
+	__ATTR(remove, S_IWUSR, NULL, remove_store),
 	__ATTR_NULL,
 };
 
-- 
1.5.4.1

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