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perfcounters/powerpc: fix oops with multiple counters in a group 

Impact: fix oops-causing bug

This fixes a bug in the powerpc hw_perf_counter_init where the code
didn't initialize ctrs[n] before passing the ctrs array to check_excludes,
leading to possible oopses and other incorrect behaviour.  This fixes it
by initializing ctrs[n] correctly.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras 2009-03-05 14:05:57 +11:00
parent b5e8acf66f
commit 86028598de
1 changed files with 1 additions and 0 deletions
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arch/powerpc/kernel/perf_counter.c
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@ -633,6 +633,7 @@ hw_perf_counter_init(struct perf_counter *counter)
return NULL; return NULL;
} }
events[n] = ev; events[n] = ev;
ctrs[n] = counter;
if (check_excludes(ctrs, n, 1)) if (check_excludes(ctrs, n, 1))
return NULL; return NULL;
if (power_check_constraints(events, n + 1)) if (power_check_constraints(events, n + 1))