[PATCH] tty: ipwireless: Replace GFP_ATOMIC with GFP_KERNEL in ipwireless_network_create

From: Jia-Ju Bai
Date: Tue Apr 10 2018 - 04:32:01 EST


ipwireless_network_create() is never called in atomic context.

The call chain ending up at ipwireless_network_create() is:
[1] ipwireless_network_create() <- config_ipwireless() <-
ipwireless_attach()
ipwireless_attach() is only set as ".probe" in struct pcmcia_driver.

Despite never getting called from atomic context,
ipwireless_network_create() 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@xxxxxxxxx>
---
drivers/tty/ipwireless/network.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/ipwireless/network.c b/drivers/tty/ipwireless/network.c
index c2f9a32..17b04b5 100644
--- a/drivers/tty/ipwireless/network.c
+++ b/drivers/tty/ipwireless/network.c
@@ -415,7 +415,7 @@ void ipwireless_network_packet_received(struct ipw_network *network,
struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
{
struct ipw_network *network =
- kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
+ kzalloc(sizeof(struct ipw_network), GFP_KERNEL);

if (!network)
return NULL;
--
1.9.1