perf/core: Fix perf_mmap() failure path

When f_ops->mmap() returns failure, m_ops->close() is *not* called.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Acked-by: Lorenzo Stoakes <[email protected]>
Reviewed-by: Ravi Bangoria <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Peter Zijlstra

kernel/events/core.c

@@ -6903,7 +6903,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 	if (!ret)
 		ret = map_range(rb, vma);
 
-	if (event->pmu->event_mapped)
+	if (!ret && event->pmu->event_mapped)
 		event->pmu->event_mapped(event, vma->vm_mm);
 
 	return ret;