[PATCH 3/3] infiniband: i40iw: Replace GFP_ATOMIC with GFP_KERNEL in i40iw_l2param_change

[PATCH 3/3] infiniband: i40iw: Replace GFP_ATOMIC with GFP_KERNEL in i40iw_l2param_change

[Jia-Ju Bai]

i40iw_l2param_change() is never called in atomic context.

i40iw_make_listen_node() is only set as ".l2_param_change" 
in struct i40e_client_ops, and this function pointer is not called 
in atomic context.

Despite never getting called from atomic context,
i40iw_l2param_change() calls kzalloc() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
 drivers/infiniband/hw/i40iw/i40iw_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c b/drivers/infiniband/hw/i40iw/i40iw_main.c
index 27590ae..b86bda8 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -1737,7 +1737,7 @@ static void i40iw_l2param_change(struct i40e_info *ldev, struct i40e_client *cli
 		return;
 
 
-	work = kzalloc(sizeof(*work), GFP_ATOMIC);
+	work = kzalloc(sizeof(*work), GFP_KERNEL);
 	if (!work)
 		return;
 
-- 
1.9.1

Re: [PATCH 3/3] infiniband: i40iw: Replace GFP_ATOMIC with GFP_KERNEL in i40iw_l2param_change

[Shiraz Saleem]

On Wed, Apr 11, 2018 at 03:33:06PM +0800, Jia-Ju Bai wrote:
> i40iw_l2param_change() is never called in atomic context.
> 
> i40iw_make_listen_node() is only set as ".l2_param_change" 
> in struct i40e_client_ops, and this function pointer is not called 
> in atomic context.
> 
> Despite never getting called from atomic context,
> i40iw_l2param_change() calls kzalloc() with GFP_ATOMIC,
> which does not sleep for allocation.
> GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
> which can sleep and improve the possibility of sucessful allocation.
> 
> This is found by a static analysis tool named DCNS written by myself.
> And I also manually check it.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
> ---
>

Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>