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[PATCH] device_shutdown can loop if the driver frees itself

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This patch changes device_shutdown() to use the newly introduced safe
reverse list traversal.  We experienced loops on system reboot if we had
removed and re-inserted our device from the device list.

We noticed this problem on PPC405. Our PCI IDE device comes and goes a lot.

Our hypothesis was that there was a loop caused by the driver->shutdown
freeing memory.  It is possible that we do something wrong as well, but
being unable to reboot is kind of nasty.

Signed-off-by: Michael Richardson <mcr@marajade.sandelman.ca>
Cc: Patrick Mochel <mochel@digitalimplant.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Richardson 2006-01-09 01:04:51 -08:00 committed by Greg Kroah-Hartman
parent 2d7b5a70e0
commit 9c08a938ce
1 changed files with 2 additions and 2 deletions
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4
drivers/base/power/shutdown.c
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@ -35,10 +35,10 @@ extern int sysdev_shutdown(void);
*/ */
void device_shutdown(void) void device_shutdown(void)
{ {
struct device * dev; struct device * dev, *devn;
down_write(&devices_subsys.rwsem); down_write(&devices_subsys.rwsem);
list_for_each_entry_reverse(dev, &devices_subsys.kset.list, list_for_each_entry_safe_reverse(dev, devn, &devices_subsys.kset.list,
kobj.entry) { kobj.entry) {
if (dev->bus && dev->bus->shutdown) { if (dev->bus && dev->bus->shutdown) {
dev_dbg(dev, "shutdown\n"); dev_dbg(dev, "shutdown\n");