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| author | Michael Richardson <mcr@sandelman.ottawa.on.ca> | 2006-01-09 01:04:51 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-13 11:26:12 -0800 |
| commit | 9c08a938ce5a3e1c9d5f764dc6ae844cb1af76ff (patch) | |
| tree | 9bd0a984b2e5466454e2633783786a516fe14484 /drivers/base/power | |
| parent | 2d7b5a70e01ff8b1b054d8313362e454e3057c5a (diff) | |
| download | blackbird-op-linux-9c08a938ce5a3e1c9d5f764dc6ae844cb1af76ff.tar.gz blackbird-op-linux-9c08a938ce5a3e1c9d5f764dc6ae844cb1af76ff.zip | |
[PATCH] device_shutdown can loop if the driver frees itself
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>
Diffstat (limited to 'drivers/base/power')
| -rw-r--r-- | drivers/base/power/shutdown.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/power/shutdown.c b/drivers/base/power/shutdown.c index a47bb74da72b..c2475f3134ea 100644 --- a/drivers/base/power/shutdown.c +++ b/drivers/base/power/shutdown.c @@ -35,10 +35,10 @@ extern int sysdev_shutdown(void); */ void device_shutdown(void) { - struct device * dev; + struct device * dev, *devn; 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) { if (dev->bus && dev->bus->shutdown) { dev_dbg(dev, "shutdown\n"); |
