Commit:     ec28297a562f2b022115b9eb82e4ea724d996240
Parent:     703071b5b93d88d5acb0edd5b9dd86c69ad970f2
Author:     Venki Pallipadi <[EMAIL PROTECTED]>
AuthorDate: Mon Mar 26 12:03:19 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Mar 27 08:55:56 2007 -0700

    [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 
    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 <[EMAIL PROTECTED]>
    Acked-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 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 * 
        unsigned int cpu = sys_dev->id;
        int retval;
+       if (cpu_is_offline(cpu))
+               return 0;
        if (unlikely(lock_policy_rwsem_write(cpu)))
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