Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ec28297a562f2b022115b9eb82e4ea724d996240
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
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 <[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 *
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();
-
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