From 312c004d36ce6c739512bac83b452f4c20ab1f62 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 16 Nov 2005 09:00:00 +0100 Subject: [PATCH] driver core: replace "hotplug" by "uevent" Leave the overloaded "hotplug" word to susbsystems which are handling real devices. The driver core does not "plug" anything, it just exports the state to userspace and generates events. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- Documentation/powerpc/eeh-pci-error-recovery.txt | 31 ++++++++++++------------ 1 file changed, 16 insertions(+), 15 deletions(-) (limited to 'Documentation/powerpc') diff --git a/Documentation/powerpc/eeh-pci-error-recovery.txt b/Documentation/powerpc/eeh-pci-error-recovery.txt index e75d747..67a11a3 100644 --- a/Documentation/powerpc/eeh-pci-error-recovery.txt +++ b/Documentation/powerpc/eeh-pci-error-recovery.txt @@ -115,7 +115,7 @@ Current PPC64 Linux EEH Implementation At this time, a generic EEH recovery mechanism has been implemented, so that individual device drivers do not need to be modified to support EEH recovery. This generic mechanism piggy-backs on the PCI hotplug -infrastructure, and percolates events up through the hotplug/udev +infrastructure, and percolates events up through the userspace/udev infrastructure. Followiing is a detailed description of how this is accomplished. @@ -172,7 +172,7 @@ A handler for the EEH notifier_block events is implemented in drivers/pci/hotplug/pSeries_pci.c, called handle_eeh_events(). It saves the device BAR's and then calls rpaphp_unconfig_pci_adapter(). This last call causes the device driver for the card to be stopped, -which causes hotplug events to go out to user space. This triggers +which causes uevents to go out to user space. This triggers user-space scripts that might issue commands such as "ifdown eth0" for ethernet cards, and so on. This handler then sleeps for 5 seconds, hoping to give the user-space scripts enough time to complete. @@ -258,29 +258,30 @@ rpa_php_unconfig_pci_adapter() { // in rpaphp_pci.c calls pci_destroy_dev (struct pci_dev *) { calls - device_unregister (&dev->dev) { // in /drivers/base/core.c + device_unregister (&dev->dev) { // in /drivers/base/core.c calls - device_del(struct device * dev) { // in /drivers/base/core.c + device_del(struct device * dev) { // in /drivers/base/core.c calls - kobject_del() { //in /libs/kobject.c + kobject_del() { //in /libs/kobject.c calls - kobject_hotplug() { // in /libs/kobject.c + kobject_uevent() { // in /libs/kobject.c calls - kset_hotplug() { // in /lib/kobject.c + kset_uevent() { // in /lib/kobject.c calls - kset->hotplug_ops->hotplug() which is really just + kset->uevent_ops->uevent() // which is really just a call to - dev_hotplug() { // in /drivers/base/core.c + dev_uevent() { // in /drivers/base/core.c calls - dev->bus->hotplug() which is really just a call to - pci_hotplug () { // in drivers/pci/hotplug.c + dev->bus->uevent() which is really just a call to + pci_uevent () { // in drivers/pci/hotplug.c which prints device name, etc.... } } - then kset_hotplug() calls - call_usermodehelper () with - argv[0]=hotplug_path[] which is "/sbin/hotplug" - --> event to userspace, + then kobject_uevent() sends a netlink uevent to userspace + --> userspace uevent + (during early boot, nobody listens to netlink events and + kobject_uevent() executes uevent_helper[], which runs the + event process /sbin/hotplug) } } kobject_del() then calls sysfs_remove_dir(), which would -- cgit v1.1