| commit | 5c87f0c04abf876c8019c04ff581976a9a241206 | |
| author | Thomas Gleixner <tglx@linutronix.de> | |
| Thu, 10 Dec 2009 14:35:10 +0000 (10 15:35 +0100) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Wed, 6 Jan 2010 22:26:22 +0000 (6 14:26 -0800) | ||
| tree | 0db1a372467c01f642484f66fd8b34a982997eea | treesnapshot (tar.gz zip) |
| parent | c7d622e356d6a21b788bd34cef607e01ae28c197 | commitdiff |
clockevents: Prevent clockevent_devices list corruption on cpu hotplug
commit bb6eddf7676e1c1f3e637aa93c5224488d99036f upstream.
Xiaotian Feng triggered a list corruption in the clock events list on
CPU hotplug and debugged the root cause.
If a CPU registers more than one per cpu clock event device, then only
the active clock event device is removed on CPU_DEAD. The unused
devices are kept in the clock events device list.
On CPU up the clock event devices are registered again, which means
that we list_add an already enqueued list_head. That results in list
corruption.
Resolve this by removing all devices which are associated to the dead
CPU on CPU_DEAD.
Reported-by: Xiaotian Feng <dfeng@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Xiaotian Feng <dfeng@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit bb6eddf7676e1c1f3e637aa93c5224488d99036f upstream.
Xiaotian Feng triggered a list corruption in the clock events list on
CPU hotplug and debugged the root cause.
If a CPU registers more than one per cpu clock event device, then only
the active clock event device is removed on CPU_DEAD. The unused
devices are kept in the clock events device list.
On CPU up the clock event devices are registered again, which means
that we list_add an already enqueued list_head. That results in list
corruption.
Resolve this by removing all devices which are associated to the dead
CPU on CPU_DEAD.
Reported-by: Xiaotian Feng <dfeng@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Xiaotian Feng <dfeng@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| kernel/time/clockevents.c | diffblobblamehistory |