Re: [patch] tracing: checking for NULL instead of IS_ERR()

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Hi Dan,

On 04/23/2016 05:23 AM, Dan Carpenter wrote:
tracing_map_elt_alloc() returns ERR_PTRs on error, never NULL.

Fixes: 08d43a5fa063 ('tracing: Add lock-free tracing_map')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
index e0f1729..e7dfc5e 100644
--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -814,7 +814,7 @@ static struct tracing_map_elt *copy_elt(struct tracing_map_elt *elt)
  	unsigned int i;

  	dup_elt = tracing_map_elt_alloc(elt->map);
-	if (!dup_elt)
+	if (IS_ERR(dup_elt))
  		return NULL;

  	if (elt->map->ops && elt->map->ops->elt_copy)


Thanks for fixing this. I found another one along the same lines which I'll send a patch for shortly.

Acked-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
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