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powerpc/cell/oprofile: Avoid double vfree of profile buffer

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If an error occurs on opcontrol start, the event and per cpu buffers
are released.  If later opcontrol shutdown is called then the free
function will be called again to free buffers that no longer
exist.  This results in a kernel oops.  The following changes
prevent the call to delete buffers that don't exist.

Signed-off-by: Carl Love <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Robert Richter <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
This commit is contained in:
Carl Love 2008-08-11 17:25:43 +10:00 • committed by Paul Mackerras
commit f4156d1cd1
2 changed files with 5 additions and 1 deletions
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4
drivers/oprofile/cpu_buffer.c
View file

@ -38,8 +38,10 @@ void free_cpu_buffers(void)
{
int i;
for_each_online_cpu(i)
for_each_online_cpu(i) {
vfree(per_cpu(cpu_buffer, i).buffer);
per_cpu(cpu_buffer, i).buffer = NULL;
}
}
int alloc_cpu_buffers(void)

2
drivers/oprofile/event_buffer.c
View file

@ -93,6 +93,8 @@ out:
void free_event_buffer(void)
{
vfree(event_buffer);
event_buffer = NULL;
}