lkml.org 
[lkml]   [2018]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2] net: nsci: Replace GFP_ATOMIC with GFP_KERNEL in ncsi_register_dev
Date
ncsi_register_dev() is never called in atomic context.
This function is only called by ftgmac100_probe() in
drivers/net/ethernet/faraday/ftgmac100.c.
And ftgmac100_probe() is only set as ".probe" in "struct platform_driver".

Despite never getting called from atomic context,
ncsi_register_dev() 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>
---
v2:
* Modify the description of GFP_ATOMIC in v1.
Thank Eric for good advice.
---
net/ncsi/ncsi-manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 3fd3c39..6b5b5a0 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1508,7 +1508,7 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
return nd;

/* Create NCSI device */
- ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
+ ndp = kzalloc(sizeof(*ndp), GFP_KERNEL);
if (!ndp)
return NULL;

--
1.9.1
\
 
 \ /
  Last update: 2018-04-10 03:17    [W:0.137 / U:0.748 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site