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perf: Fix locking for PERF_FORMAT_GROUP

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We should hold event->child_mutex when iterating the inherited
counters, we should hold ctx->mutex when iterating siblings.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212509.251030114@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-20 22:19:56 +01:00 committed by Ingo Molnar
parent 59ed446f79
commit 6f10581aea
1 changed files with 13 additions and 7 deletions
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20
kernel/perf_event.c
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@ -1782,6 +1782,7 @@ u64 perf_event_read_value(struct perf_event *event, u64 *enabled, u64 *running)
*enabled = 0;
*running = 0;
mutex_lock(&event->child_mutex);
total += perf_event_read(event);
*enabled += event->total_time_enabled +
atomic64_read(&event->child_total_time_enabled);
@ -1793,6 +1794,7 @@ u64 perf_event_read_value(struct perf_event *event, u64 *enabled, u64 *running)
*enabled += child->total_time_enabled;
*running += child->total_time_running;
}
mutex_unlock(&event->child_mutex);
return total;
}
@ -1802,10 +1804,12 @@ static int perf_event_read_group(struct perf_event *event,
u64 read_format, char __user *buf)
{
struct perf_event *leader = event->group_leader, *sub;
int n = 0, size = 0, ret = 0;
int n = 0, size = 0, ret = -EFAULT;
struct perf_event_context *ctx = leader->ctx;
u64 values[5];
u64 count, enabled, running;
mutex_lock(&ctx->mutex);
count = perf_event_read_value(leader, &enabled, &running);
values[n++] = 1 + leader->nr_siblings;
@ -1820,9 +1824,9 @@ static int perf_event_read_group(struct perf_event *event,
size = n * sizeof(u64);
if (copy_to_user(buf, values, size))
return -EFAULT;
goto unlock;
ret += size;
ret = size;
list_for_each_entry(sub, &leader->sibling_list, group_entry) {
n = 0;
@ -1833,11 +1837,15 @@ static int perf_event_read_group(struct perf_event *event,
size = n * sizeof(u64);
if (copy_to_user(buf + size, values, size))
return -EFAULT;
if (copy_to_user(buf + size, values, size)) {
ret = -EFAULT;
goto unlock;
}
ret += size;
}
unlock:
mutex_unlock(&ctx->mutex);
return ret;
}
@ -1884,12 +1892,10 @@ perf_read_hw(struct perf_event *event, char __user *buf, size_t count)
return -ENOSPC;
WARN_ON_ONCE(event->ctx->parent_ctx);
mutex_lock(&event->child_mutex);
if (read_format & PERF_FORMAT_GROUP)
ret = perf_event_read_group(event, read_format, buf);
else
ret = perf_event_read_one(event, read_format, buf);
mutex_unlock(&event->child_mutex);
return ret;
}