After checking all possible call chains to he_open() here,
my tool finds that he_open() is never called in atomic context.
And this function is assigned to a function pointer "dev->ops->open",
which is only called by __vcc_connect() (net/atm/common.c)
through dev->ops->send(), and __vcc_connect() is only called by
vcc_connect(), which calls mutex_lock(),
so it indicates that he_open() can call functions which may sleep.
Thus GFP_ATOMIC is not necessary, and it can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
drivers/atm/he.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/atm/he.c b/drivers/atm/he.c
index e58538c..fea5bf0 100644
--- a/drivers/atm/he.c
+++ b/drivers/atm/he.c
@@ -2135,7 +2135,7 @@ static int he_start(struct atm_dev *dev)
cid = he_mkcid(he_dev, vpi, vci);
- he_vcc = kmalloc(sizeof(struct he_vcc), GFP_ATOMIC);
+ he_vcc = kmalloc(sizeof(struct he_vcc), GFP_KERNEL);
if (he_vcc == NULL) {
hprintk("unable to allocate he_vcc during open\n");
return -ENOMEM;
--
1.7.9.5
