fs/dcache: Fix indefinite wait in d_invalidate()
In the path of task exit, the proc dentries corresponding to this
task will be killed by moving it to a shrink list. If those dentries
are already claimed by another task for shrinking, the exiting
task waits in a tight loop until those dentries are killed. This can
potentially result in a deadlock if those dentries are corresponding
to an RT task but the task which is shrinking those dentries is a
lower priority task. Fix this by not doing tight loop, if our dentries
are claimed by other task.
Change-Id: If6848521469db7dea2bbba0dbaf8597094716267
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
diff --git a/fs/dcache.c b/fs/dcache.c
index 5ff9b41..3c8c1a1 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1412,7 +1412,7 @@
goto out;
if (dentry->d_flags & DCACHE_SHRINK_LIST) {
- data->found++;
+ goto out;
} else {
if (dentry->d_flags & DCACHE_LRU_LIST)
d_lru_del(dentry);