Re: [PATCH] padata: get_next is never NULL

[Steffen Klassert]

On Wed, Apr 12, 2017 at 10:40:19AM +0200, Jason A. Donenfeld wrote:
> Per Dan's static checker warning, the code that returns NULL was removed
> in 2010, so this patch updates the comments and fixes the code
> assumptions.
> 
> Signed-off-by: Jason A. Donenfeld 
> Reported-by: Dan Carpenter 

This looks ok,

Acked-by: Steffen Klassert 

[PATCH] padata: get_next is never NULL

[Jason A. Donenfeld]

Per Dan's static checker warning, the code that returns NULL was removed
in 2010, so this patch updates the comments and fixes the code
assumptions.

Signed-off-by: Jason A. Donenfeld 
Reported-by: Dan Carpenter 
---
 kernel/padata.c | 13 -
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/padata.c b/kernel/padata.c
index f1aef1639204..ac8f1e524836 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -154,8 +154,6 @@ EXPORT_SYMBOL(padata_do_parallel);
  * A pointer to the control struct of the next object that needs
  * serialization, if present in one of the percpu reorder queues.
  *
- * NULL, if all percpu reorder queues are empty.
- *
  * -EINPROGRESS, if the next object that needs serialization will
  *  be parallel processed by another cpu and is not yet present in
  *  the cpu's reorder queue.
@@ -182,8 +180,6 @@ static struct padata_priv *padata_get_next(struct 
parallel_data *pd)
cpu = padata_index_to_cpu(pd, next_index);
next_queue = per_cpu_ptr(pd->pqueue, cpu);
 
-   padata = NULL;
-
reorder = _queue->reorder;
 
spin_lock(>lock);
@@ -235,12 +231,11 @@ static void padata_reorder(struct parallel_data *pd)
padata = padata_get_next(pd);
 
/*
-* All reorder queues are empty, or the next object that needs
-* serialization is parallel processed by another cpu and is
-* still on it's way to the cpu's reorder queue, nothing to
-* do for now.
+* If the next object that needs serialization is parallel
+* processed by another cpu and is still on it's way to the
+* cpu's reorder queue, nothing to do for now.
 */
-   if (!padata || PTR_ERR(padata) == -EINPROGRESS)
+   if (PTR_ERR(padata) == -EINPROGRESS)
break;
 
/*
-- 
2.12.2