[PATCH] blktrace: fix trace mutex deadlock

[Jens Axboe]

A previous commit changed the locking around registration/cleanup,
but direct callers of blk_trace_remove() were missed. This means
that if we hit the error path in setup, we will deadlock on
attempting to re-acquire the queue trace mutex.

Fixes: 1f2cac107c59 ("blktrace: fix unlocked access to 
init/start-stop/teardown")
Signed-off-by: Jens Axboe <ax...@kernel.dk>

---

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 206e0e2ace53..f224985de5fa 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -591,7 +591,7 @@ static int __blk_trace_setup(struct request_queue *q, char 
*name, dev_t dev,
                return ret;
 
        if (copy_to_user(arg, &buts, sizeof(buts))) {
-               blk_trace_remove(q);
+               __blk_trace_remove(q);
                return -EFAULT;
        }
        return 0;
@@ -637,7 +637,7 @@ static int compat_blk_trace_setup(struct request_queue *q, 
char *name,
                return ret;
 
        if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) {
-               blk_trace_remove(q);
+               __blk_trace_remove(q);
                return -EFAULT;
        }
 

-- 
Jens Axboe