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| author | Venki Pallipadi <venkatesh.pallipadi@intel.com> | 2007-03-26 12:03:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-27 08:55:56 -0700 |
| commit | ec28297a562f2b022115b9eb82e4ea724d996240 (patch) | |
| tree | 37443cab75290b45b65b491f6dd56882fad38dec | |
| parent | 703071b5b93d88d5acb0edd5b9dd86c69ad970f2 (diff) | |
| download | op-kernel-dev-ec28297a562f2b022115b9eb82e4ea724d996240.zip op-kernel-dev-ec28297a562f2b022115b9eb82e4ea724d996240.tar.gz | |
[PATCH] Fix maxcpus=1 trigerring BUG() in cpufreq
Ingo reported it on lkml in the thread
"2.6.21-rc5: maxcpus=1 crash in cpufreq: kernel BUG at drivers/cpufreq/cpufreq.c:82!"
This check added to remove_dev is symmetric to one in add_dev and handles
callbacks for offline cpus cleanly.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f52facc..3162010 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1015,6 +1015,10 @@ static int cpufreq_remove_dev (struct sys_device * sys_dev) { unsigned int cpu = sys_dev->id; int retval; + + if (cpu_is_offline(cpu)) + return 0; + if (unlikely(lock_policy_rwsem_write(cpu))) BUG(); |
