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fault-inject: fix wrong should_fail() decision in task context 

Commit 1203c8e6fb ("fault-inject: simplify access check for fail-nth")
unintentionally broke a conditional statement in should_fail().  Any
faults are not injected in the task context by the change when the
systematic fault injection is not used.

This change restores to the previous correct behaviour.

Link: http://lkml.kernel.org/r/1501633700-3488-1-git-send-email-akinobu.mita@gmail.com
Fixes: 1203c8e6fb ("fault-inject: simplify access check for fail-nth")
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reported-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Tested-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2017-08-10 15:23:53 -07:00 committed by Linus Torvalds
parent 4e98ebe5f4
commit 9eeb52ae71
1 changed files with 5 additions and 3 deletions
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4
lib/fault-inject.c
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@ -110,11 +110,13 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
if (in_task()) {
unsigned int fail_nth = READ_ONCE(current->fail_nth);
if (fail_nth && !WRITE_ONCE(current->fail_nth, fail_nth - 1))
if (fail_nth) {
if (!WRITE_ONCE(current->fail_nth, fail_nth - 1))
goto fail;
return false;
}
}
/* No need to check any other properties if the probability is 0 */
if (attr->probability == 0)